Add a curated theme system for "modern" style widgets, inspired by Tesserae

Frame.theme (7 presets in app/theme_tokens.py) drives font family,
corner radius, drop shadow, and an accent hue for every modern-style
widget's header/accent region. Rich accent colors (not just the 6 flat
panel inks) are approximated via denser Bayer stippling confined to just
that region (html_render.ordered_dither_regions), so icon/text content
elsewhere stays exactly as crisp as it is today -- verified directly
against real Chromium renders, both in unit tests and via run-server.
"classic" is a byte-identical no-visual-change default: weather's header
keeps its original fixed blue gradient, tasks/calendar keep their flat
THEME_* ink.

Themes are purely stylistic -- battery's charge-level color, calendar/
tasks' per-owner event chips, and text's own per-widget font choice are
never touched.

.claude/skills/build-firmware/SKILL.md

@@ -0,0 +1,128 @@
+---
+name: build-firmware
+description: Compile the espresso_frame ESP32-C6 firmware (firmware/) for both board variants without Docker -- a native, non-container ESP-IDF v6.0 install. Use when asked to build the firmware, verify a firmware/main/*.c change actually compiles, or check both the devkit and xiao board targets.
+---
+
+Compiles `firmware/` (ESP-IDF, targeting ESP32-C6) locally, without
+Docker -- CI's `firmware-build-check.yml`/`firmware-release-build.yml`
+build inside the `espressif/idf:release-v6.0` container image, but
+**this sandbox cannot run containers at all**: `docker.io` installs and
+`dockerd` starts fine even as root, but the sandbox strips
+`cap_sys_admin` (and blocks the bare `unshare` syscall) from the
+capability set regardless of uid, which container image-layer
+extraction and namespace setup both require. Confirmed by hand:
+`docker run hello-world` fails to extract even the tiny hello-world
+layer ("failed to extract layer... operation not permitted" with the
+overlayfs snapshotter; "unshare: operation not permitted" even with
+the vfs storage driver instead). This is a hard restriction of the
+sandbox itself, not a permissions/setup problem -- don't spend time
+re-trying `--privileged`-equivalent flags or alternate storage drivers,
+none of it routes around a missing `cap_sys_admin`.
+
+The workaround: skip containers entirely and install ESP-IDF the same
+way a developer would set it up on their own machine (`git clone` +
+ESP-IDF's own `install.sh`) -- that path needs nothing this sandbox
+disallows, just normal file/process operations.
+
+## Setup (once per fresh container)
+
+```bash
+bash .claude/skills/build-firmware/setup.sh
+```
+
+Installs (via real `apt-get` -- this container actually has root and a
+working package manager, unlike run-server's Chromium bootstrap which
+had neither):
+- OS build deps: `python3`/`venv`/`pip`, `cmake`, `ninja-build`,
+  `flex`/`bison`/`gperf`, `build-essential`, `libusb-1.0-0`.
+- ESP-IDF itself: a shallow, single-branch, recursive-submodule clone
+  of `release/v6.0` (~700MB) into `~/.espressif-idf/esp-idf` -- matches
+  the IDF version CI's Docker image pins. Only clones once; re-running
+  `setup.sh` never touches an existing checkout.
+- The esp32c6 toolchain + Python venv, via ESP-IDF's own
+  `./install.sh esp32c6` -- scoped to just this project's one target
+  (see `firmware/README.md`'s board table), not every chip ESP-IDF
+  supports, to keep the download/disk footprint down. `install.sh` is
+  already idempotent on its own, so `setup.sh` always calls it rather
+  than duplicating that check -- a re-run costs a few seconds once
+  everything's cached.
+
+Takes a few minutes on a cold run (mostly `install.sh`'s own pip/tool
+downloads), well under a minute on a re-run. Needs real root (`apt-get
+install`) -- if this container ever runs as non-root, this setup
+doesn't apply as-is (would need the same non-root apt-download +
+`dpkg-deb -x` extraction dance `run-server`'s `setup.sh` uses for
+Chromium).
+
+Disk: budget ~4GB free before starting (esp-idf checkout + toolchain +
+Python env land around 3.4GB in `~/.espressif`, plus the ~700MB
+checkout itself). Confirmed working with as little as ~7GB free.
+
+## Build
+
+```bash
+bash .claude/skills/build-firmware/build.sh            # devkit (default)
+bash .claude/skills/build-firmware/build.sh xiao
+bash .claude/skills/build-firmware/build.sh both        # both variants
+```
+
+Each board gets its own build directory and generated sdkconfig (see
+`firmware/build_for_board.sh`'s own comment) -- building one never
+disturbs the other. `build.sh` auto-runs `set-target esp32c6` the very
+first time a board is built (no generated sdkconfig yet); later builds
+skip straight to `idf.py build`. Extra arguments pass straight through
+to `idf.py`, e.g.:
+
+```bash
+bash .claude/skills/build-firmware/build.sh xiao flash -p /dev/ttyUSB0
+```
+
+`flash`/`monitor` need an actual attached device and serial port --
+this sandbox has neither, so those only work when this skill runs
+somewhere hardware is actually plugged in (a real dev machine, or a
+differently-configured environment with device passthrough).
+
+A clean build of one board takes ~30s once the target's already been
+configured (~1,000 build steps total split across both boards, most of
+it ESP-IDF's own components -- this project's own `firmware/main/*.c`
+and `firmware/components/*` sources are a small fraction of that and
+compile in a few seconds). Output lands at
+`firmware/build/espresso_frame.bin` (devkit) or
+`firmware/build_xiao/espresso_frame.bin` (xiao) -- both paths are
+gitignored (`firmware/.gitignore`... actually the repo root
+`.gitignore`'s "ESP-IDF firmware build output" section), so nothing
+here needs cleaning up before a commit.
+
+## Verified
+
+Both board variants (`devkit` set-target esp32c6 + build, `xiao`
+set-target esp32c6 + build) built successfully end-to-end using this
+exact setup.sh/build.sh pair, producing real
+`espresso_frame.bin` images with normal free-space margins (41%/36%
+of their respective app partitions) and no errors -- only one
+pre-existing, unrelated warning (`battery.c`'s unused `TAG` when that
+file's logging is compiled out). This is a real compile check, not
+just a syntax read -- if a future change breaks the build, this skill
+will actually catch it.
+
+## Troubleshooting
+
+- **`docker: ... unshare: operation not permitted` / `failed to
+  extract layer ... operation not permitted`**: expected in this
+  sandbox, see the top of this file. Don't debug it further -- use this
+  skill's native install instead.
+- **`ESP-IDF not found at ... -- run setup.sh first`**: `build.sh`'s
+  own check for a missing `$IDF_DIR/export.sh` -- run `setup.sh` (see
+  above) before the first build.
+- **`idf.py: command not found` if you try to run it directly**: same
+  gotcha `firmware/build_for_board.sh` already documents -- `idf.py` is
+  normally a shell *function* from ESP-IDF's `export.sh`, not on PATH
+  as a real executable, so it isn't inherited into a script's own
+  subshell even after sourcing `export.sh` in your interactive shell
+  first. Use `build.sh` (or `build_for_board.sh`, which calls
+  `python "$IDF_PATH/tools/idf.py"` directly) instead of typing
+  `idf.py` in a fresh script/subshell.
+- **Disk pressure during `install.sh`**: this environment runs close to
+  full (single-digit GB free is normal, not a sign of a leak) --
+  `df -h /` before running `setup.sh` if a build mysteriously fails
+  partway with a "no space left on device"-shaped error.

.claude/skills/build-firmware/build.sh

@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+# Builds (or flashes/monitors, if a serial port is actually attached)
+# the espresso_frame firmware for one board variant, via the project's
+# own firmware/build_for_board.sh -- this script just sources the
+# ESP-IDF environment first and auto-runs `set-target esp32c6` on a
+# board's very first build (a fresh clone has no generated sdkconfig
+# yet, same reasoning as CI's own build steps -- see firmware/README.md's
+# "Building for the Seeed XIAO ESP32-C6" section).
+#
+# Usage:
+#   build.sh                        # build devkit (default)
+#   build.sh devkit
+#   build.sh xiao
+#   build.sh both                   # build both board variants
+#   build.sh xiao flash -p /dev/ttyUSB0   # only meaningful with real hardware attached
+set -euo pipefail
+
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+firmware_dir="$(git -C "$script_dir" rev-parse --show-toplevel)/firmware"
+
+IDF_DIR="$HOME/.espressif-idf/esp-idf"
+if [ ! -f "$IDF_DIR/export.sh" ]; then
+  echo "ESP-IDF not found at $IDF_DIR -- run setup.sh first" >&2
+  exit 1
+fi
+# export.sh is chatty and assumes an interactive shell prompt in spots;
+# redirect its own stdout, not ours, so build.sh's actual output (and a
+# real failure's stderr) stays visible.
+source "$IDF_DIR/export.sh" > /dev/null
+
+cd "$firmware_dir"
+
+build_one() {
+  local board="$1"
+  shift
+  local sdkconfig
+  case "$board" in
+    devkit) sdkconfig="sdkconfig" ;;
+    xiao) sdkconfig="sdkconfig.xiao_local" ;;
+    *) echo "Unknown board '$board' -- expected 'devkit' or 'xiao'" >&2; exit 1 ;;
+  esac
+
+  if [ ! -f "$sdkconfig" ]; then
+    echo "==> $board: no generated sdkconfig yet, setting target esp32c6"
+    ./build_for_board.sh "$board" set-target esp32c6
+  fi
+
+  local args=("$@")
+  if [ ${#args[@]} -eq 0 ]; then
+    args=(build)
+  fi
+  ./build_for_board.sh "$board" "${args[@]}"
+}
+
+board="${1:-devkit}"
+shift || true
+
+if [ "$board" = "both" ]; then
+  build_one devkit "$@"
+  build_one xiao "$@"
+else
+  build_one "$board" "$@"
+fi

.claude/skills/build-firmware/setup.sh

@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+# One-time (idempotent) environment bootstrap for compiling the
+# espresso_frame firmware (firmware/) without Docker -- see this
+# skill's SKILL.md for why not Docker, even though that's what CI uses.
+# Re-run any time; every step is safe/fast to repeat once already done.
+set -euo pipefail
+
+IDF_ROOT="$HOME/.espressif-idf"
+IDF_DIR="$IDF_ROOT/esp-idf"
+# Matches the espressif/idf:release-v6.0 image CI's
+# firmware-build-check.yml/firmware-release-build.yml use -- keep this
+# in sync with those workflow files if the project's pinned IDF version
+# ever changes.
+IDF_BRANCH="release/v6.0"
+
+# 1. OS packages ESP-IDF's own install.sh needs (python3 + venv/pip,
+# cmake, ninja, a C toolchain for the odd host-side code generator, git
+# for the clone below, flex/bison/gperf for mbedtls/etc.'s generated
+# parsers, libusb for esptool's USB/JTAG bits even though this skill
+# doesn't flash real hardware). Installed via apt with real root --
+# unlike run-server's Chromium bootstrap, this container actually has
+# root and a working apt, so no non-root extraction dance is needed
+# here.
+PKGS="git python3 python3-venv python3-pip cmake ninja-build ccache libusb-1.0-0 wget flex bison gperf build-essential"
+missing=()
+for pkg in $PKGS; do
+  dpkg -s "$pkg" >/dev/null 2>&1 || missing+=("$pkg")
+done
+if [ ${#missing[@]} -gt 0 ]; then
+  echo "installing OS packages: ${missing[*]}"
+  apt-get update
+  DEBIAN_FRONTEND=noninteractive apt-get install -y "${missing[@]}"
+fi
+
+# 2. ESP-IDF checkout -- shallow, single branch, recursive submodules
+# also shallow (~700MB total, vs. several GB for a full clone). Only
+# clones once; re-running this script never re-clones or resets it, so
+# any local changes you made for debugging survive a re-run.
+if [ ! -d "$IDF_DIR/.git" ]; then
+  echo "cloning esp-idf $IDF_BRANCH into $IDF_DIR ..."
+  mkdir -p "$IDF_ROOT"
+  git clone --branch "$IDF_BRANCH" --depth 1 --shallow-submodules --recursive \
+    https://github.com/espressif/esp-idf.git "$IDF_DIR"
+else
+  echo "esp-idf already cloned at $IDF_DIR"
+fi
+
+# 3. Toolchain + Python virtualenv, scoped to esp32c6 only -- this
+# project's one target (see firmware/README.md's board table). Scoping
+# avoids downloading toolchains for every chip ESP-IDF supports, which
+# matters given this container's disk headroom. install.sh is already
+# idempotent on its own (checks what's present and skips it), so this
+# always calls it rather than trying to duplicate that check here --
+# a re-run only costs a few seconds once everything's cached.
+echo "running esp-idf install.sh esp32c6 (fast if already installed) ..."
+(cd "$IDF_DIR" && ./install.sh esp32c6)
+
+echo "setup complete -> $IDF_DIR/export.sh (build.sh sources this for you)"

.claude/skills/make-widget/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: make-widget
-description: Scaffold a new widget type for the espresso_frame server (the ~13-file checklist a widget type touches -- config table, grid footprint, render module, registry, migration, config-save + endpoints, dialog template + JS, script tag, WIDGET_LABELS, docs, tests). Use when asked to add a new widget type to a frame's panel (e.g. "add a text widget", "add an RSS widget", "add a weather-only widget").
+description: Scaffold a new widget type for the espresso_frame server (the ~14-file checklist a widget type touches -- config table, grid footprint, render module, registry, migration, config-save + endpoints, dialog template + JS, script tag, WIDGET_LABELS, docs, saved-layout config allowlist, tests). Use when asked to add a new widget type to a frame's panel (e.g. "add a text widget", "add an RSS widget", "add a weather-only widget").
 ---
 
 Adding a widget type is a very consistent, repeated pattern in this
@@ -114,6 +114,16 @@ Pick your template accordingly:
     `MIN_FOOTPRINT` prose line, the `app/widgets/` module list. This is
     the project's own "start here" doc per `CLAUDE.md` -- don't ship a
     widget without it staying accurate.
+14. **`app/routers/api_layouts.py`** -- add a `"<type>": (...)` entry to
+    `LAYOUT_CONFIG_FIELDS` listing the config columns that are an
+    authored *setting* (as opposed to runtime/cache state like a fetch
+    cache or queue position, which a saved layout deliberately leaves
+    out -- see the dict's own comment). Skipping this doesn't error or
+    warn anywhere: the widget just silently saves/applies with an empty
+    `{}` config forever, resetting to defaults on every layout apply or
+    hold-to-cycle. This actually shipped missing for the weather widget
+    -- caught only because a user noticed layout-cycling kept resetting
+    its city/mode.
 
 ## Tests (`server/tests/`)
 
@@ -138,6 +148,13 @@ Pick your template accordingly:
 - Any pure-logic helper module (decoding, parsing -- like
   `app/image_upload.py`) gets its own `test_<module>.py`: no HTTP, no
   DB, just the function.
+- `test_saved_layouts.py` -- a `test_save_and_apply_round_trip_<type>_settings`
+  test: set every field the new `LAYOUT_CONFIG_FIELDS` entry lists,
+  save a layout, assert the `SavedLayoutWidget.config` snapshot has them
+  all, delete the frame's widgets, apply the layout back, assert the
+  new widget's config matches -- and that any runtime/cache field
+  (`checked_at`, a fetch cache, a queue) was *not* carried over. See
+  `test_save_and_apply_round_trip_weather_settings` for the pattern.
 
 Run the full suite before calling it done:
 

.claude/skills/run-server/start-server.sh

@@ -11,6 +11,7 @@ mkdir -p "$SCRATCH"
 
 DATABASE_URL="sqlite:///$SCRATCH/test.db" \
 CONFIG_PATH="$SCRATCH/config.json" \
+LOG_PATH="$SCRATCH/app.log" \
 .venv/bin/uvicorn app.main:app --host 127.0.0.1 --port "$PORT" \
   > "$SCRATCH/server.log" 2>&1 &
 PID=$!

CLAUDE.md

@@ -7,13 +7,9 @@ image processing (crop/dither/quantize/pack), and serves a placeable
 photos/calendar/whiteboard/weather widget system to the device.
 
 CURRENT TODO
--add more actions for buttons (i.e. change widget/layout)
--Fix spurious button assignment stuff (probably but buttons on widget config with sane defaults)
--battery life widget
 -sharing layouts with linked users
 -a "coming up this week" widget
--scan to download for non-immich photos too?
--switch button reset action? and on reset dismiss the menu.
+-on reset dismiss the menu.
 
 Start here, don't re-derive from scratch:
 - [`docs/architecture.md`](docs/architecture.md) -- how firmware and

docs/architecture.md

@@ -102,9 +102,9 @@ placement grid, and button-action dispatch.
    - Deep sleep for the server-configured interval on success, or a
      shorter retry interval on any failure.
 
-   The menu/reset button's soft-reset and factory-reset tiers (held ~3s
-   or ~15s) are handled earlier, before any of this, and never return --
-   see [`firmware/README.md`](../firmware/README.md#managing-the-queue-soft-resetting-and-factory-resetting).
+   The menu/reset button's soft-reset (quick press) and factory-reset
+   (held ~15s) tiers are handled earlier, before any of this, and never
+   return -- see [`firmware/README.md`](../firmware/README.md#managing-the-queue-soft-resetting-and-factory-resetting).
 
 See [`docs/hardware.md`](hardware.md) for wiring and
 [`server/README.md`](../server/README.md) for the server side.

docs/hardware.md

@@ -40,10 +40,10 @@ pressed):
   photo; see
   [`firmware/README.md`](../firmware/README.md#going-back-to-the-previous-photo).
 - **Menu / reset (GPIO1)**: one button, three actions by hold duration --
-  a quick press overlays a "scan to manage" QR code on the current photo
-  for 30 seconds; holding ~3s then releasing soft-resets the device
-  (config kept); holding ~15s factory-resets it (clears WiFi/server
-  config, reprovisions); see
+  a quick press soft-resets the device (config kept); holding ~3s then
+  releasing overlays a "scan to manage" QR code on the current photo for
+  30 seconds; holding ~15s factory-resets it (clears WiFi/server config,
+  reprovisions); see
   [`firmware/README.md`](../firmware/README.md#managing-the-queue-soft-resetting-and-factory-resetting).
 
 All three pins were picked because they're within GPIO 0-7 -- the only

docs/widgets.md

@@ -148,6 +148,134 @@ grid footprint, rather than continuously scaling constants tuned for a
 full ~800x480 canvas -- falls back to agenda view if a widget is too small
 for month view to stay legible.
 
+### "Modern" render style (experimental)
+
+Every widget type except photos has a `render_style` column (`"classic"`
+default | `"modern"`) that swaps its hand-drawn PIL primitives for an
+HTML/CSS render: a Jinja2 template (`app/templates/widget_html/`) drawn
+through a persistent headless-Chromium browser (`app/html_render.py`,
+Playwright) instead of `ImageDraw` -- gradients, shadows, and soft icon
+shading PIL can't easily do. Calendar's own modern-style builders (all
+four view modes) live in `app/calendar_html_render.py` rather than
+`html_render.py` itself, mirroring `calendar_render.py`'s own separation
+from the simpler widget types.
+
+Every modern-style builder runs its own `ordered_dither` (Bayer/ordered,
+not Floyd-Steinberg) before returning, committing the widget to exact
+palette colors *before* compositing -- safe to mix with photo/other
+classic-rendered widgets on the same frame without a Floyd-Steinberg
+seam at the boundary, because ordered dithering has no cross-pixel error
+term the way Floyd-Steinberg's diffusion does (see `html_render.py`'s
+module docstring). No `Frame`-level dithering setting was needed to make
+this work.
+
+Not offered for the **photos** widget -- a real photograph isn't a
+synthesized dashboard card, and photos has a different concern instead:
+its own independent palette/dithering strength (`Frame.photo_palette_rgb`
+/ `photo_dither_strength`, a second "Photos configuration" card in
+Advanced Configuration, separate from the main `palette_rgb`/
+`dither_strength` every other widget uses). `widgets/photos.py`'s
+`render()` quantizes itself against these before returning, so a frame
+can tune the rest of its widgets' look (e.g. a calibrated palette for
+modern-style dashboard widgets) independently of what actually looks
+best for real photographs, with no `render_panel` changes needed --
+see that module's own docstring for the one small, accepted edge case
+(a border on a photos widget whose palette genuinely diverges from the
+frame's main one).
+
+Playwright/Chromium is a real, heavyweight runtime dependency imported
+lazily only when a widget actually uses modern style. Its browser binary
+is fetched by `start.sh` at container startup rather than baked into the
+image (see `server/Dockerfile`'s own comment) -- a single ~181MB
+`chrome-headless-shell` binary can't be split across Docker layers the
+way this project's pip/npm installs were, and confirmed-failed to push
+to the registry as a build-time layer; cached on the `/data` volume
+(`PLAYWRIGHT_BROWSERS_PATH`) so only the very first boot on a fresh
+volume actually downloads it. Still real-panel-unverified -- treat every
+"modern" style as experimental regardless of deploy status.
+
+Per-widget-type notes:
+
+- **weather**: `current`/`daily` modes only -- `hourly`/`multi_city`
+  always render classic regardless of this setting (see the Weather
+  widget section below).
+- **calendar**: all four view modes (agenda/today_tomorrow/week/month)
+  have a modern builder -- the only widget type with full modern-style
+  coverage from the start, rather than a partial rollout like weather's.
+  Month view's "falls back to agenda below a size threshold" behavior
+  (`_month_view_fits`) is honored identically in both styles.
+- **battery/text/tasks**: full coverage (both battery modes; text reuses
+  its own `_fit()` shrink-to-fit sizing logic, only the drawing differs).
+- **static image/whiteboard**: modern style is the *first* visual chrome
+  either widget type has ever had (classic draws the image with zero
+  frame/card at all) -- a rounded-corner, shadowed card
+  (`framed_image.html.jinja`, shared between the two) wrapping the
+  already-composed image.
+
+### Themes for modern-style widgets
+
+`Frame.theme` (String, default `"classic"`, one Advanced Configuration
+`<select>`) picks a curated visual preset for every modern-style widget
+on that frame -- font family, corner radius, drop shadow, and an accent
+hue for widgets with a header/accent region. Presets live in
+`app/theme_tokens.py`'s `THEMES` dict; `resolve_theme(theme_name,
+widget_kind, palette_rgb)` turns one into concrete, ready-to-render
+values (`accent_hex`/`accent_hex_dark`, resolved `font_regular`/
+`font_bold` file paths, `radius`, `shadow`, `accent_amplitude`). Inspired
+by [Tesserae](https://github.com/dmellok/tesserae)'s (AGPL-3.0) own
+three-layer CSS custom-property theme system -- this is an original
+reimplementation of that *architecture*, not a copy of its token file
+(see this repo's `CLAUDE.md` on copyleft dependencies).
+
+**A theme is purely stylistic, never functional color-coding.** Battery's
+charge-level red/yellow/green, calendar/tasks' per-owner event color
+chips, and text's user-authored inline run colors are status/identity
+signals, not style choices -- no theme may recolor them, and every
+`build_*`/`resolve_theme` call site that touches those stays on its own
+existing logic untouched. Text's own per-widget `font_family` setting
+(a user's explicit content-level choice, same carve-out reasoning) is
+similarly never overridden by a theme -- `build_text` accepts a
+`theme_name` param for signature uniformity with every other modern-
+style builder but deliberately ignores it.
+
+**Rich accent hues, not just the 6 exact panel inks.** A theme's
+`accent_hex` can be any arbitrary color (e.g. terracotta, moss, slate) --
+`html_render.ordered_dither_regions(rendered, palette_rgb,
+base_amplitude, accent_regions=[(rect, amplitude), ...])` dithers the
+whole widget at the existing safe default (`ordered_dither`'s tuned 48,
+unchanged, still icon/text-legible) and then *separately* re-dithers
+just the accent rectangle (a header bar's already-computed pixel rect)
+at a theme's higher `accent_amplitude` (~130) and pastes it back. Safe
+to do per-region for the same reason `ordered_dither` itself is safe
+per-widget: ordered (Bayer) dithering has no cross-pixel error term, so
+a region's result depends only on its own pixels. A single higher
+amplitude applied to the *whole* widget instead was tried and rejected --
+it washes out pale content (a weather icon's white cloud body nearly
+vanished in testing); confining the higher amplitude to just the accent
+rect avoids that while still letting the rect approximate a rich hue via
+denser stippling instead of flatly snapping to one nearest ink (what
+happens to a rich hue at the base amplitude).
+
+**"classic" is a deliberately no-visual-change default.** Its
+`accent_hex` is `None`, meaning "keep this widget kind's own pre-theme
+look exactly": weather's header was always a fixed blue gradient (now
+`theme_tokens._CLASSIC_WEATHER_GRADIENT`, byte-identical to the old
+module-level `ACCENT_START`/`ACCENT_END` constants this system
+replaced); tasks/calendar's header was always a flat single ink resolved
+through `panel_style.THEME` (still is, just via `resolve_theme` now).
+Widget kinds with no ink of their own (battery/text/static/whiteboard)
+fall back to black, though none of their templates currently have an
+accent-colored surface for it to visibly affect.
+
+Which widgets get the richer accent-region treatment: weather's
+`build_daily` (the header bar, when `city_label` is set), tasks, and
+calendar's four view builders (each already computed a `header_h` in
+Python for layout, reused as the accent rect). Weather's `build_current`,
+battery, and static/whiteboard's shared `build_framed_image` are
+theme-aware for font/radius/shadow only -- no header/accent region to
+dither richer, so they call plain `ordered_dither` exactly as before
+themes existed.
+
 ## Button actions
 
 Each physical button (NEXT/BACK) runs the `(widget, action)` binding of
@@ -269,6 +397,11 @@ modes (`WeatherWidgetConfig.mode`, switchable in the widget's dialog like
   side -- the calendar widget's embedded strip, as a standalone
   widget's whole content instead of a strip above an agenda day.
 
+**Render style** (`WeatherWidgetConfig.render_style`, `"classic"` default
+| `"modern"`, experimental) -- see "Modern render style" above; weather's
+own modern coverage is `current`/`daily` only, `hourly`/`multi_city`
+always render classic regardless of this setting.
+
 `current`/`hourly`/`daily` share one configured location
 (`city_label`/`city_latitude`/`city_longitude`, set via `POST .../
 weather-location`, geocoded through `weather.geocode_city`); `multi_city`

firmware/README.md

@@ -66,7 +66,7 @@ Under **ESPresso Frame Configuration**:
 | `FRAME_NEXT_BUTTON_GPIO` | 2 | Next-photo button GPIO (-1 to disable). Must be 0-7 (ESP32-C6's deep-sleep-wakeup-capable pins) |
 | `FRAME_BACK_BUTTON_GPIO` | 0 | Back-photo button GPIO (-1 to disable). Must be 0-7 |
 | `FRAME_COMBO_BUTTON_GPIO` | 1 | Menu/reset button GPIO (-1 to disable). Must be 0-7 |
-| `FRAME_COMBO_SOFT_RESET_HOLD_MS` | 3000 | How long the combo button must be held (then released) to soft-reset |
+| `FRAME_COMBO_MENU_HOLD_MS` | 3000 | How long the combo button must be held (then released) to show the management menu |
 | `FRAME_COMBO_FACTORY_RESET_HOLD_MS` | 15000 | How long the combo button must be held to factory-reset |
 | `FRAME_HOLD_ACTION_MS` | 3000 | **Fallback only** -- how long NEXT/BACK must be held to trigger a global action instead of a short press; see below |
 | `FRAME_BATTERY_ADC_GPIO` | -1 (disabled) | Battery voltage-divider ADC GPIO; see the Battery section below |
@@ -294,9 +294,13 @@ One more button, wired between GPIO1 and GND (same wiring style as the
 other buttons), covers three actions -- disambiguated purely by how
 long it's held:
 
-**A quick press** wakes the device and overlays several corners of
-whatever photo is currently showing, leaving the middle of the photo
-visible and unchanged:
+**A quick press** soft-resets the device -- `esp_restart()`, keeping the
+stored WiFi/server config. Useful for recovering a hung device without
+losing setup.
+
+**Holding it ~3 seconds, then releasing** wakes the device (if asleep)
+and overlays several corners of whatever photo is currently showing,
+leaving the middle of the photo visible and unchanged:
 
 - **Top-right**: a QR code -- "SCAN TO MANAGE" -- linking to the
   server's config page.
@@ -315,8 +319,9 @@ for faces Immich hasn't been told a name for; no face detection happens
 on the device or the server, this is entirely Immich's own People
 feature). A third press exits immediately rather than waiting out the
 30-second timer. Holding the button during this stage doesn't trigger
-either reset tier below -- the hold-duration read only ever happens
-once, right when the device first wakes, before any menu is shown.
+the factory-reset tier below -- the hold-duration read only ever
+happens once, right when the device first wakes, before any menu is
+shown.
 
 The device stays awake for the whole menu interaction (up to three
 physical refreshes: the base overlay, the escalated one, and
@@ -324,17 +329,13 @@ reverting), so this costs meaningfully more power than a normal wake --
 expected for a deliberate, occasional action, same tradeoff as the
 other buttons.
 
-**Holding it ~3 seconds, then releasing** soft-resets the device --
-`esp_restart()`, keeping the stored WiFi/server config. Useful for
-recovering a hung device without losing setup.
-
 **Holding it ~15 seconds** (whether or not you're still holding it --
 this fires immediately, it doesn't wait for release) clears the stored
 WiFi/server config and restarts into provisioning. From either power-on
 or while the device is deep-asleep, since this GPIO is armed as a
 wakeup source.
 
-See `FRAME_COMBO_BUTTON_GPIO`, `FRAME_COMBO_SOFT_RESET_HOLD_MS`, and
+See `FRAME_COMBO_BUTTON_GPIO`, `FRAME_COMBO_MENU_HOLD_MS`, and
 `FRAME_COMBO_FACTORY_RESET_HOLD_MS` above to change the pin or hold
 durations, or disable all three actions.
 

firmware/main/Kconfig.projbuild

@@ -154,13 +154,12 @@ menu "ESPresso Frame Configuration"
             Button wired between this GPIO and GND (active-low, internal
             pull-up enabled in firmware -- no external resistor needed).
             One pin, three actions depending on how long it's held:
-            a quick press shows the management menu (same as before);
-            holding it FRAME_COMBO_SOFT_RESET_HOLD_MS then releasing
-            soft-resets the device (reboots, keeps the stored WiFi/
-            server config); holding it all the way to
-            FRAME_COMBO_FACTORY_RESET_HOLD_MS clears the stored config
-            and restarts into provisioning, regardless of whether it's
-            released yet. Must be GPIO 0-7 for the same deep-sleep-
+            a quick press soft-resets the device (reboots, keeps the
+            stored WiFi/server config); holding it FRAME_COMBO_MENU_HOLD_MS
+            then releasing shows the management menu; holding it all the
+            way to FRAME_COMBO_FACTORY_RESET_HOLD_MS clears the stored
+            config and restarts into provisioning, regardless of whether
+            it's released yet. Must be GPIO 0-7 for the same deep-sleep-
             wakeup reason as FRAME_NEXT_BUTTON_GPIO above; defaults to
             a different pin than the other buttons. Set to -1 to
             disable the feature entirely (also disables the management
@@ -168,14 +167,14 @@ menu "ESPresso Frame Configuration"
             reconfiguring then only works by erasing NVS over USB, see
             firmware/README.md).
 
-    config FRAME_COMBO_SOFT_RESET_HOLD_MS
-        int "Soft-reset hold duration (ms)"
+    config FRAME_COMBO_MENU_HOLD_MS
+        int "Management-menu hold duration (ms)"
         default 3000
         depends on FRAME_COMBO_BUTTON_GPIO >= 0
         help
             How long the menu/reset button must be held before releasing
-            it triggers a soft reset (reboot, config kept). Long enough
-            to be clearly distinct from a quick menu-opening press.
+            it shows the management menu instead of soft-resetting. Long
+            enough to be clearly distinct from a quick reset tap.
 
     config FRAME_COMBO_FACTORY_RESET_HOLD_MS
         int "Factory-reset hold duration (ms)"
@@ -185,8 +184,8 @@ menu "ESPresso Frame Configuration"
             How long the menu/reset button must be held continuously
             before the device clears its stored config and reboots into
             provisioning, regardless of release. Comfortably longer than
-            FRAME_COMBO_SOFT_RESET_HOLD_MS so the two tiers can't be
-            confused for each other.
+            FRAME_COMBO_MENU_HOLD_MS so the two tiers can't be confused
+            for each other.
 
     config FRAME_HOLD_ACTION_MS
         int "Next/back hold-for-global-action duration (ms)"

firmware/main/combo_button.c

@@ -53,8 +53,8 @@ bool combo_button_check(void)
         return false; /* not pressed, and didn't cause this wake either */
     }
 
-    ESP_LOGI(TAG, "Combo button held -- quick press for menu, %dms for soft reset, %dms for factory reset",
-             CONFIG_FRAME_COMBO_SOFT_RESET_HOLD_MS, CONFIG_FRAME_COMBO_FACTORY_RESET_HOLD_MS);
+    ESP_LOGI(TAG, "Combo button held -- quick press for soft reset, %dms for menu, %dms for factory reset",
+             CONFIG_FRAME_COMBO_MENU_HOLD_MS, CONFIG_FRAME_COMBO_FACTORY_RESET_HOLD_MS);
 
     int elapsed_ms = 0;
     while (gpio_get_level(COMBO_BUTTON_GPIO) == 0) {
@@ -70,13 +70,13 @@ bool combo_button_check(void)
         }
     }
 
-    if (elapsed_ms >= CONFIG_FRAME_COMBO_SOFT_RESET_HOLD_MS) {
-        ESP_LOGW(TAG, "Held %dms and released, soft-restarting (config kept)", elapsed_ms);
-        esp_restart();
+    if (elapsed_ms >= CONFIG_FRAME_COMBO_MENU_HOLD_MS) {
+        ESP_LOGI(TAG, "Held %dms and released, showing management menu", elapsed_ms);
+        return true;
     }
 
-    ESP_LOGI(TAG, "Quick press (%dms), showing management menu", elapsed_ms);
-    return true;
+    ESP_LOGW(TAG, "Quick press (%dms), soft-restarting (config kept)", elapsed_ms);
+    esp_restart();
 }
 
 bool combo_button_is_pressed(void)

firmware/main/combo_button.h

@@ -16,11 +16,11 @@ void combo_button_init(void);
  * Checks the combined menu/reset button and acts on how long it was
  * held, evaluated once per wake:
  *   - Not pressed: returns false immediately.
- *   - Released before CONFIG_FRAME_COMBO_SOFT_RESET_HOLD_MS (a quick
- *     press): returns true -- caller should show the management menu.
- *   - Released between the soft-reset and factory-reset thresholds: a
- *     soft reset (esp_restart(), stored WiFi/server config kept) --
+ *   - Released before CONFIG_FRAME_COMBO_MENU_HOLD_MS (a quick press):
+ *     a soft reset (esp_restart(), stored WiFi/server config kept) --
  *     never returns.
+ *   - Released between the menu and factory-reset thresholds: returns
+ *     true -- caller should show the management menu.
  *   - Held through CONFIG_FRAME_COMBO_FACTORY_RESET_HOLD_MS: a factory
  *     reset (frame_config_clear() + esp_restart(), fires immediately
  *     without waiting for release) -- never returns.

firmware/version.txt

@@ -1 +1 @@
-1.4.0
+1.4.1

server/Dockerfile

@@ -36,9 +36,61 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     tzdata fontconfig fonts-dejavu-core nodejs npm \
     && rm -rf /var/lib/apt/lists/*
 
+# EXPERIMENTAL. System libs a headless Chromium needs (app/html_render.py, the weather widget's
+# opt-in "modern" render style), trimmed from Playwright's own full
+# `install-deps chromium` list to just what a headless (no Xvfb),
+# Latin-text-plus-emoji use case needs: dropped xvfb (only needed for a
+# *headed* browser) and the CJK/Cyrillic/Thai locale font packages
+# (fonts-ipafont-gothic, fonts-wqy-zenhei, fonts-tlwg-loma-otf,
+# xfonts-cyrillic, xfonts-scalable, fonts-freefont-ttf, fonts-unifont) --
+# fonts-noto-color-emoji is the one that actually matters here (real
+# color emoji in the weather icons, vs. WeasyPrint/Pango's monochrome
+# fallback glyphs in this feature's original spike).
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libasound2t64 libatk-bridge2.0-0t64 libatk1.0-0t64 libatspi2.0-0t64 \
+    libcairo2 libcups2t64 libdbus-1-3 libdrm2 libgbm1 libglib2.0-0t64 \
+    libnspr4 libnss3 libpango-1.0-0 libx11-6 libxcb1 libxcomposite1 \
+    libxdamage1 libxext6 libxfixes3 libxkbcommon0 libxrandr2 \
+    fonts-noto-color-emoji libfontconfig1 libfreetype6 fonts-liberation \
+    && rm -rf /var/lib/apt/lists/*
+
 COPY requirements.txt .
+# Split across several layers rather than one `pip install -r
+# requirements.txt` -- same Cloudflare single-blob/layer payload-size
+# limit as render-service's npm installs below. The single combined
+# layer was measured at ~113MB unpacked, over the limit on its own.
+# Isolating the largest packages gets every layer's unpacked size well
+# clear of 100MB (sqlalchemy ~15MB, pillow ~19MB, pypdfium2 ~8MB, the
+# remaining `-r requirements.txt` layer ~71MB). Each package version here
+# still comes from requirements.txt (`pip install -r` for everything that
+# doesn't need its own layer skips these, since pip sees them already
+# satisfied); the explicit versions below just control *when* each
+# installs -- same "single source of truth, just splitting *when* it
+# installs" tradeoff as the npm section's --no-save comment below.
+RUN pip install --no-cache-dir sqlalchemy==2.0.51
+RUN pip install --no-cache-dir pillow==12.3.0
+RUN pip install --no-cache-dir pypdfium2==5.12.1
+RUN pip install --no-cache-dir playwright==1.61.0
 RUN pip install --no-cache-dir -r requirements.txt
 
+# The headless Chromium binary itself is deliberately NOT installed
+# here at build time. `playwright install chromium-headless-shell`
+# unpacks to ~262MB, and its single `chrome-headless-shell` binary alone
+# (measured: 181MB) is one file -- unlike the pip/npm splits above
+# (independently-installable smaller packages moved into their own
+# layers), a single 181MB file can't be divided across multiple <100MB
+# Docker layers by any ordinary COPY/RUN restructuring; the whole file
+# lands in whichever layer's diff contains it, which confirmed-failed
+# to push to this project's registry (the same Cloudflare single-blob/
+# layer limit that forced the pip/npm splits elsewhere in this file --
+# see their comments). Fix: start.sh downloads it at container startup
+# instead, cached on the /data volume (PLAYWRIGHT_BROWSERS_PATH below)
+# so it survives restarts/redeploys and only ever downloads once per
+# volume, not once per image layer. Trade-off: first boot on a fresh
+# volume needs network access to Playwright's CDN -- true of Immich/
+# weather API access too, so not a new requirement for this server.
+ENV PLAYWRIGHT_BROWSERS_PATH=/data/.playwright-browsers
+
 # render-service/'s dependencies installed as several separate layers
 # rather than one `npm install` covering all of them -- a from-scratch
 # push of this image once hit Cloudflare's payload-size limit on a

server/README.md

@@ -91,11 +91,19 @@ algorithm itself -- it just streams the response straight to the panel.
   again until a recharge is detected and it crosses again. No SMTP
   configured, or no email on the relevant account, and both features
   silently no-op rather than erroring.
+- **Server logs.** `/admin/logs` shows the tail of the process's own
+  log file (`LOG_PATH` env var, default `/data/server.log` -- the same
+  `/data` volume as the database and legacy config, so it survives
+  container restarts/redeploys; `LOG_LEVEL` env var, default `INFO`).
+  Rotates at ~2MB x 3 backups; the page only reads the current file,
+  "Download full log" streams it raw. There's no log shipping/
+  aggregation beyond this -- it's a single-container deployment, so
+  the file *is* the log.
 
 ## Endpoints
 
 Pages: `/` (routing hub), `/setup`, `/login`, `/claim`, `/settings`,
-`/admin`, `/frames/{id}` (Photos), `/frames/{id}/config`,
+`/admin`, `/admin/logs`, `/frames/{id}` (Photos), `/frames/{id}/config`,
 `/frames/{id}/stats`, `/m/{manage_token}`.
 
 ### Device protocol (`/frame/*` -- paths frozen; auth = `?id=` + `?token=`)

server/app/calendar_html_render.py

@@ -0,0 +1,327 @@
+"""Calendar widget's "modern" render style -- all four view modes
+(agenda/today_tomorrow/week/month), mirroring calendar_render.py's own
+_build dispatch shape exactly so app/widgets/calendar.py and the
+calendar preview endpoint can call either module identically. Kept in
+its own module rather than joining app/html_render.py's other build_*
+functions, mirroring calendar_render.py's own separation from the
+simpler widgets (calendar is the one case where html_render.py growing
+a 5th unrelated builder starts to hurt readability).
+
+Reuses calendar_render's own private helpers (_events_on_day/_event_
+colors/_event_start/_fmt_time/_weather_for_day/_month_view_fits/
+_add_months) so a modern-style view's event list/colors/times/weather/
+month-grid math match the classic renderer's data exactly -- only the
+drawing differs, same relationship weather's build_current/build_daily
+have with weather_render.py."""
+
+from __future__ import annotations
+
+import calendar as calendar_module
+from datetime import date, datetime, timedelta
+from zoneinfo import ZoneInfo
+
+from PIL import Image
+
+from . import html_render, panel_style, theme_tokens
+from .calendar_render import (
+    MARGIN,
+    WEEKDAY_NAMES,
+    _add_months,
+    _event_colors,
+    _event_start,
+    _events_on_day,
+    _fmt_time,
+    _month_view_fits,
+    _weather_for_day,
+)
+
+
+def _weather_row(weather_cities, day, units) -> list[dict]:
+    entries = _weather_for_day(weather_cities, day)
+    return [
+        {"emoji": html_render.CATEGORY_EMOJI.get(e["category"], ""), "high": round(e["high"]), "low": round(e["low"])}
+        for e in entries
+    ]
+
+
+def _day_section_data(day: date, events: list[dict], tz: ZoneInfo, palette_rgb, weather_cities,
+                      weather_units: str, owners_seen: list[str], rows_avail_h: int, row_h: int) -> dict:
+    """One day's {header, weather_entries, rows, more_count} -- shared by
+    build_agenda/build_today_tomorrow/build_week's vertical layout, same
+    reuse relationship calendar_render._draw_agenda_day has with
+    _build_agenda/_build_today_tomorrow. `rows_avail_h` is the *rows*
+    area's own pixel budget only -- the caller has already reserved a
+    separate, uniform header_h (which is where weather actually renders,
+    see the day-header macro) for every section, so this function
+    doesn't need to account for weather space itself."""
+    header = day.strftime("%A, %B ") + str(day.day)
+    weather_entries = _weather_row(weather_cities, day, weather_units)
+    max_rows = max(0, rows_avail_h // row_h)
+
+    day_events = _events_on_day(events, day, tz)
+    rows = []
+    for event in day_events[:max_rows]:
+        colors = _event_colors(event, owners_seen, palette_rgb)
+        time_str = "All day" if event["all_day"] else _fmt_time(_event_start(event, tz))
+        rows.append({"colors": [html_render._rgb_to_hex(c) for c in colors], "time": time_str,
+                     "summary": event["summary"]})
+    return {"header": header, "weather_entries": weather_entries, "rows": rows,
+            "more_count": max(0, len(day_events) - max_rows)}
+
+
+def build_agenda(events: list[dict], browse_offset: int, target_w: int, target_h: int, tz: ZoneInfo,
+                 palette_rgb: list | None = None, weather_cities: list[dict] | None = None,
+                 weather_units: str = "fahrenheit", theme_name: str | None = None) -> Image.Image:
+    """HTML/CSS-rendered analogue of calendar_render._build_agenda. Has a
+    header bar -- dithered at the theme's accent_amplitude via
+    ordered_dither_regions."""
+    theme = theme_tokens.resolve_theme(theme_name, "calendar", palette_rgb)
+    day = datetime.now(tz).date() + timedelta(days=browse_offset)
+    title_size = max(14, min(target_w, target_h) // 12)
+    body_size = max(11, min(target_w, target_h) // 20)
+    weather_size = max(10, body_size - 2)
+    row_h = body_size + 14
+    unit_suffix = "F" if weather_units == "fahrenheit" else "C"
+
+    # Single day -- no cross-section alignment concern, so header_h can
+    # simply reflect whether THIS day actually has weather (unlike
+    # build_today_tomorrow/build_week's vertical layout, which must
+    # reserve the same header_h for every stacked section regardless).
+    has_weather = bool(_weather_row(weather_cities, day, weather_units))
+    header_h = title_size + 24 + ((weather_size + 12) if has_weather else 0)
+
+    owners_seen: list[str] = []
+    data = _day_section_data(day, events, tz, palette_rgb, weather_cities, weather_units, owners_seen,
+                             target_h - header_h - MARGIN, row_h)
+
+    template = html_render._jinja_env.get_template("calendar_agenda.html.jinja")
+    html = template.render(
+        w=target_w, h=target_h, gutter=panel_style.GUTTER, radius=theme["radius"], shadow=theme["shadow"],
+        font_regular=theme["font_regular"], font_bold=theme["font_bold"],
+        header=data["header"], title_size=title_size, header_h=header_h,
+        accent_start=theme["accent_hex"], accent_end=theme["accent_hex_dark"], weather_entries=data["weather_entries"],
+        weather_size=weather_size, unit_suffix=unit_suffix, rows=data["rows"],
+        more_count=data["more_count"], row_h=row_h, body_size=body_size,
+    )
+    rendered = html_render.render_html_to_image(html, target_w, target_h)
+    gutter = panel_style.GUTTER
+    accent_rect = (gutter, gutter, target_w - gutter, gutter + header_h)
+    return html_render.ordered_dither_regions(
+        rendered, palette_rgb, accent_regions=[(accent_rect, theme["accent_amplitude"])]
+    )
+
+
+def build_today_tomorrow(events: list[dict], browse_offset: int, target_w: int, target_h: int, tz: ZoneInfo,
+                         palette_rgb: list | None = None, weather_cities: list[dict] | None = None,
+                         weather_units: str = "fahrenheit", theme_name: str | None = None) -> Image.Image:
+    """HTML/CSS-rendered analogue of calendar_render._build_today_tomorrow
+    -- two day-sections stacked (see _day_section_data), each with its own
+    header bar dithered richer via ordered_dither_regions."""
+    theme = theme_tokens.resolve_theme(theme_name, "calendar", palette_rgb)
+    start_day = datetime.now(tz).date() + timedelta(days=browse_offset)
+    section_h = target_h // 2
+    title_size = max(13, section_h // 8)
+    body_size = max(10, min(target_w, target_h) // 26)
+    weather_size = max(9, body_size - 2)
+    row_h = body_size + 12
+    unit_suffix = "F" if weather_units == "fahrenheit" else "C"
+
+    day_dates = [start_day + timedelta(days=i) for i in range(2)]
+    # Uniform across both stacked sections regardless of which day(s)
+    # actually have weather -- see _day_section_data's own docstring for
+    # why a per-day header height misaligns where rows start.
+    any_weather = any(_weather_row(weather_cities, d, weather_units) for d in day_dates)
+    header_h = title_size + 16 + ((weather_size + 10) if any_weather else 0)
+
+    owners_seen: list[str] = []
+    days = [
+        _day_section_data(d, events, tz, palette_rgb, weather_cities, weather_units, owners_seen,
+                          section_h - header_h, row_h)
+        for d in day_dates
+    ]
+
+    template = html_render._jinja_env.get_template("calendar_today_tomorrow.html.jinja")
+    html = template.render(
+        w=target_w, h=target_h, gutter=panel_style.GUTTER, radius=theme["radius"], shadow=theme["shadow"],
+        font_regular=theme["font_regular"], font_bold=theme["font_bold"],
+        days=days, title_size=title_size, header_h=header_h,
+        accent_start=theme["accent_hex"], accent_end=theme["accent_hex_dark"], weather_size=weather_size,
+        unit_suffix=unit_suffix, row_h=row_h, body_size=body_size,
+    )
+    rendered = html_render.render_html_to_image(html, target_w, target_h)
+    gutter = panel_style.GUTTER
+    accent_regions = [
+        ((gutter, gutter + i * section_h, target_w - gutter, gutter + i * section_h + header_h),
+         theme["accent_amplitude"])
+        for i in range(len(days))
+    ]
+    return html_render.ordered_dither_regions(rendered, palette_rgb, accent_regions=accent_regions)
+
+
+def build_week(events: list[dict], browse_offset: int, target_w: int, target_h: int, tz: ZoneInfo,
+              week_start: int, palette_rgb: list | None = None, weather_cities: list[dict] | None = None,
+              weather_units: str = "fahrenheit", days: int = 7, layout: str = "horizontal",
+              start_offset: int = 0, theme_name: str | None = None) -> Image.Image:
+    """HTML/CSS-rendered analogue of calendar_render._build_week -- both
+    the vertical (stacked day-sections, reusing build_today_tomorrow's
+    template with an arbitrary day count) and horizontal (side-by-side
+    columns) layouts. Each header (per-section or per-column) dithers
+    richer via ordered_dither_regions."""
+    theme = theme_tokens.resolve_theme(theme_name, "calendar", palette_rgb)
+    gutter = panel_style.GUTTER
+    today = datetime.now(tz).date()
+    if days == 7:
+        days_since_start = (today.weekday() - week_start) % 7
+        week_first_day = today - timedelta(days=days_since_start) + timedelta(days=days * browse_offset)
+    else:
+        week_first_day = today + timedelta(days=start_offset) + timedelta(days=days * browse_offset)
+    unit_suffix = "F" if weather_units == "fahrenheit" else "C"
+    owners_seen: list[str] = []
+
+    if layout == "vertical":
+        section_h = target_h // days
+        title_size = max(11, min(20, section_h // 6))
+        body_size = max(9, min(target_w, target_h) // (18 + days))
+        weather_size = max(8, body_size - 2)
+        row_h = body_size + 10
+        day_dates = [week_first_day + timedelta(days=i) for i in range(days)]
+        # Uniform across all `days` stacked sections -- see
+        # _day_section_data's own docstring for why a per-day header
+        # height misaligns where rows start.
+        any_weather = any(_weather_row(weather_cities, d, weather_units) for d in day_dates)
+        header_h = title_size + 12 + ((weather_size + 8) if any_weather else 0)
+        day_sections = [
+            _day_section_data(d, events, tz, palette_rgb, weather_cities, weather_units, owners_seen,
+                             section_h - header_h, row_h)
+            for d in day_dates
+        ]
+        template = html_render._jinja_env.get_template("calendar_today_tomorrow.html.jinja")
+        html = template.render(
+            w=target_w, h=target_h, gutter=gutter, radius=theme["radius"], shadow=theme["shadow"],
+            font_regular=theme["font_regular"], font_bold=theme["font_bold"],
+            days=day_sections, title_size=title_size, header_h=header_h,
+            accent_start=theme["accent_hex"], accent_end=theme["accent_hex_dark"], weather_size=weather_size,
+            unit_suffix=unit_suffix, row_h=row_h, body_size=body_size,
+        )
+        rendered = html_render.render_html_to_image(html, target_w, target_h)
+        accent_regions = [
+            ((gutter, gutter + i * section_h, target_w - gutter, gutter + i * section_h + header_h),
+             theme["accent_amplitude"])
+            for i in range(len(day_sections))
+        ]
+        return html_render.ordered_dither_regions(rendered, palette_rgb, accent_regions=accent_regions)
+
+    header_size = max(10, min(16, (target_w // days) // 6))
+    chip_size = max(9, header_size - 3)
+    weather_size = max(8, chip_size - 1)
+    col_w = max(1, (target_w - panel_style.GUTTER * 2) // days)
+    row_h = chip_size + 8
+    # Reserve weather-line room in every column's header uniformly
+    # (whether or not THIS specific day has a cached forecast) -- a
+    # per-column height that depends on that day's own data would
+    # misalign where each column's event rows start across the week
+    # grid the moment any single day lacks a forecast entry.
+    header_h = header_size + 22 + (weather_size + 6 if weather_cities else 0)
+    max_rows = max(0, (target_h - panel_style.GUTTER * 2 - header_h) // row_h)
+
+    cols = []
+    for i in range(days):
+        day = week_first_day + timedelta(days=i)
+        label = day.strftime("%a %-d") if day != today else f"★ {day.strftime('%a %-d')}"
+        weather_entries = _weather_row(weather_cities, day, weather_units)
+        day_events = _events_on_day(events, day, tz)
+        rows = []
+        for event in day_events[:max_rows]:
+            color = html_render._rgb_to_hex(_event_colors(event, owners_seen, palette_rgb)[0])
+            summary = event["summary"] if event["all_day"] else f"{_fmt_time(_event_start(event, tz))[:-3]} {event['summary']}"
+            rows.append({"color": color, "summary": summary})
+        cols.append({
+            "label": label, "weather": weather_entries[0] if weather_entries else None,
+            "rows": rows, "more_count": max(0, len(day_events) - max_rows),
+        })
+
+    template = html_render._jinja_env.get_template("calendar_week_horizontal.html.jinja")
+    html = template.render(
+        w=target_w, h=target_h, gutter=gutter, radius=theme["radius"], shadow=theme["shadow"],
+        font_regular=theme["font_regular"], font_bold=theme["font_bold"],
+        cols=cols, header_size=header_size, chip_size=chip_size,
+        header_h=header_h, weather_size=weather_size, unit_suffix=unit_suffix,
+        accent_start=theme["accent_hex"], accent_end=theme["accent_hex_dark"],
+    )
+    rendered = html_render.render_html_to_image(html, target_w, target_h)
+    accent_rect = (gutter, gutter, target_w - gutter, gutter + header_h)
+    return html_render.ordered_dither_regions(rendered, palette_rgb, accent_regions=[(accent_rect, theme["accent_amplitude"])])
+
+
+def build_month(events: list[dict], browse_offset: int, target_w: int, target_h: int, tz: ZoneInfo,
+               week_start: int, palette_rgb: list | None = None, theme_name: str | None = None) -> Image.Image:
+    """HTML/CSS-rendered analogue of calendar_render._build_month --
+    density dots per day, not literal event text, same reasoning as the
+    classic renderer (real text at typical month-cell size is close to
+    unreadable on a 6-color dithered e-ink panel). The per-owner event
+    dots are identity-coding (like every other calendar view's chips) and
+    are never touched by a theme; only the weekday-name row (a flat
+    accent background, no gradient in this view) dithers richer via
+    ordered_dither_regions."""
+    theme = theme_tokens.resolve_theme(theme_name, "calendar", palette_rgb)
+    gutter = panel_style.GUTTER
+    today = datetime.now(tz).date()
+    target_month = _add_months(date(today.year, today.month, 1), browse_offset)
+    weeks_dates = list(
+        calendar_module.Calendar(firstweekday=week_start).monthdatescalendar(target_month.year, target_month.month)
+    )
+    day_names = [n[:3] for n in (WEEKDAY_NAMES[week_start:] + WEEKDAY_NAMES[:week_start])]
+
+    header_size = max(11, min(16, target_h // 30))
+    day_size = max(10, min(15, target_w // 55))
+    dot_size = max(4, day_size // 2)
+
+    owners_seen: list[str] = []
+    weeks = []
+    for week in weeks_dates:
+        row = []
+        for day in week:
+            day_events = _events_on_day(events, day, tz)
+            dots = [html_render._rgb_to_hex(_event_colors(e, owners_seen, palette_rgb)[0]) for e in day_events[:4]]
+            row.append({
+                "day_num": day.day, "in_month": day.month == target_month.month,
+                "is_today": day == today, "dots": dots, "more_count": max(0, len(day_events) - 4),
+            })
+        weeks.append(row)
+
+    template = html_render._jinja_env.get_template("calendar_month.html.jinja")
+    html = template.render(
+        w=target_w, h=target_h, gutter=gutter, radius=theme["radius"], shadow=theme["shadow"],
+        font_regular=theme["font_regular"], font_bold=theme["font_bold"],
+        day_names=day_names, weeks=weeks,
+        header_size=header_size, day_size=day_size, dot_size=dot_size, accent_start=theme["accent_hex"],
+    )
+    rendered = html_render.render_html_to_image(html, target_w, target_h)
+    weekday_row_h = header_size + 12
+    accent_rect = (gutter, gutter, target_w - gutter, gutter + weekday_row_h)
+    return html_render.ordered_dither_regions(rendered, palette_rgb,
+                                              accent_regions=[(accent_rect, theme["accent_amplitude"])])
+
+
+def build(events: list[dict], view: str, browse_offset: int, target_w: int, target_h: int, tz: ZoneInfo,
+         week_start: int, palette_rgb: list | None = None, weather_cities: list[dict] | None = None,
+         weather_units: str = "fahrenheit", week_days: int = 7, week_layout: str = "horizontal",
+         week_start_offset: int = 0, theme_name: str | None = None) -> Image.Image:
+    """Dispatches to the right build_* -- mirrors calendar_render._build's
+    exact "month falls back to agenda when it doesn't fit" resolution, so
+    a narrow month-mode widget set to modern style still gets a sensible
+    modern view instead of erroring or silently reverting to classic."""
+    effective_view = view
+    if view == "month" and not _month_view_fits(target_w, target_h):
+        effective_view = "agenda"
+
+    if effective_view == "agenda":
+        return build_agenda(events, browse_offset, target_w, target_h, tz, palette_rgb, weather_cities,
+                            weather_units, theme_name)
+    if effective_view == "today_tomorrow":
+        return build_today_tomorrow(events, browse_offset, target_w, target_h, tz, palette_rgb, weather_cities,
+                                    weather_units, theme_name)
+    if effective_view == "week":
+        return build_week(events, browse_offset, target_w, target_h, tz, week_start, palette_rgb, weather_cities,
+                          weather_units, week_days, week_layout, week_start_offset, theme_name)
+    return build_month(events, browse_offset, target_w, target_h, tz, week_start, palette_rgb, theme_name)

server/app/calendar_render.py

@@ -11,7 +11,7 @@ Event dicts here are calendar_feed.py's shape: {"summary", "start", "end"
 (ISO 8601 strings), "all_day", "sources": [{"owner_display_name",
 "color_index"}, ...]} -- more than one entry in "sources" means
 merge_events collapsed several calendars' identical (same title/time)
-events into one, see _event_colors/_draw_color_bar below.
+events into one, see _event_colors/panel_style.draw_color_chip below.
 """
 
 from __future__ import annotations
@@ -26,6 +26,7 @@ from zoneinfo import ZoneInfo
 
 from PIL import Image, ImageDraw, ImageFont
 
+from . import panel_style
 from .image_pipeline import (
     DEFAULT_PALETTE_RGB,
     _apply_manage_overlay,
@@ -42,12 +43,20 @@ CALENDAR_VIEW_LABELS = {"agenda": "Agenda (today)", "today_tomorrow": "Agenda (t
                         "week": "Week", "month": "Month"}
 WEEKDAY_NAMES = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]
 
-MARGIN = 20
+# MARGIN carries panel_style.CONTENT_MARGIN's value unchanged (not
+# re-tuned). BG/FG are this module's own plain black/white -- checkbox
+# outlines, month-view grid hairlines -- not a text-emphasis concern (no
+# MUTED gray here anymore -- see panel_style's module docstring for why:
+# a mid-gray fill has no close palette match and dithers into speckle
+# once the whole canvas is quantized. Secondary text now reads through
+# size/weight alone, always exact black).
+MARGIN = panel_style.CONTENT_MARGIN
 BG = (255, 255, 255)
 FG = (0, 0, 0)
-MUTED = (110, 110, 110)
-# Was a light gray, but that dithers away to near-invisible once quantized
-# to the 6-color e-ink palette -- black reads as an actual line on-panel.
+# Structural dividers/grid lines (between stacked day sections, week
+# columns, month cells) stay a plain black rule -- gray dithers away to
+# near-invisible once quantized to the 6-color e-ink palette. Headers
+# no longer use this: see panel_style.draw_header_bar/theme_color.
 RULE = (0, 0, 0)
 
 # Fallback for any event whose calendar has no manually pinned color
@@ -67,7 +76,7 @@ def _event_colors(event: dict, owners_seen: list[str], palette_rgb: list | None)
     one person's calendar). Usually just one color; more than one is
     what tells the "same event, more than one calendar" case apart from
     an ordinary single-calendar event at render time -- see
-    _draw_color_bar. Each source's own manually pinned color
+    panel_style.draw_color_chip. Each source's own manually pinned color
     (FrameCalendar.color_index -- see routers/api_widgets.py's
     api_widget_calendar_color) resolves against whichever palette this frame
     actually renders with, so a pinned "Blue" stays this frame's actual
@@ -91,24 +100,6 @@ def _event_colors(event: dict, owners_seen: list[str], palette_rgb: list | None)
     return colors
 
 
-def _draw_color_bar(draw: ImageDraw.ImageDraw, x0: int, y0: int, x1: int, y1: int,
-                    colors: list[tuple[int, int, int]], radius: int) -> None:
-    """One rounded bar for a single-source event, or that same overall
-    footprint split into equal-width side-by-side segments -- one per
-    contributing calendar -- for a deduplicated shared event (see
-    _event_colors/calendar_feed.merge_events). Splitting rather than
-    e.g. concentric rings keeps every color equally "thick and bold" at
-    a glance, the same design goal a single pinned color already has."""
-    if len(colors) == 1:
-        draw.rounded_rectangle([x0, y0, x1, y1], radius=radius, fill=colors[0])
-        return
-    seg_w = (x1 - x0) / len(colors)
-    for i, color in enumerate(colors):
-        seg_x0 = round(x0 + i * seg_w)
-        seg_x1 = round(x0 + (i + 1) * seg_w) - (2 if i < len(colors) - 1 else 0)
-        draw.rectangle([seg_x0, y0, seg_x1, y1], fill=color)
-
-
 def _event_start(event: dict, tz: ZoneInfo) -> datetime | date:
     """Parses event["start"] and, for timed events, converts to `tz` --
     calendar_feed.py stores whatever timezone each source event carried
@@ -158,11 +149,12 @@ def _fmt_task_due(due: str | None) -> str:
     return d.strftime("%b %-d")
 
 
-# ImageFont.load_default() (used for everything else in this module --
-# see the module docstring) has no emoji glyphs, and PIL/FreeType don't
-# skip an unsupported codepoint, they substitute a ".notdef" tofu box (a
-# visible filled rectangle) -- reads as a rendering glitch, not "emoji
-# not supported". So event titles get drawn with two fonts: the normal
+# Neither Inter (panel_style.font_bold/font_regular, this module's own
+# body/title font -- see MARGIN/BG/FG comment above) nor PIL's bundled
+# default font has emoji glyphs, and PIL/FreeType don't skip an
+# unsupported codepoint, they substitute a ".notdef" tofu box (a visible
+# filled rectangle) -- reads as a rendering glitch, not "emoji not
+# supported". So event titles get drawn with two fonts: the normal
 # text font for everything else, and one of these for actual emoji runs
 # (see _split_emoji_runs/_draw_mixed_line) -- both Noto Emoji, OFL-1.1,
 # vendored at app/fonts/ (license alongside at app/fonts/OFL.txt).
@@ -401,15 +393,17 @@ def _draw_agenda_day(img: Image.Image, draw: ImageDraw.ImageDraw, day: date, eve
     these vertically without duplicating the row-layout/truncation
     logic. Weather is drawn above the event list -- eating into the same
     row budget the event count is truncated against, exactly like the
-    header/rule above it already does."""
+    header bar above it already does."""
     x0, y0, w, h = region
-    text_x0, text_y0 = x0 + MARGIN, y0 + MARGIN
+    header_h = title_font.size + 20
+    panel_style.draw_header_bar(draw, (x0, y0, w, header_h), header_h,
+                                panel_style.theme_color("calendar", palette_rgb))
+    text_x0 = x0 + MARGIN
     text_w = w - MARGIN * 2
     header = day.strftime("%A, %B ") + str(day.day)
-    draw_text(img, (text_x0, text_y0), _truncate_to_width(draw, header, title_font, text_w), title_font)
-    y = text_y0 + title_font.size + 12
-    draw.line([(text_x0, y), (text_x0 + text_w, y)], fill=RULE)
-    y += 12
+    draw_text(img, (text_x0, y0 + (header_h - title_font.size) // 2),
+             _truncate_to_width(draw, header, title_font, text_w), title_font, BG)
+    y = y0 + header_h + 12
 
     weather_entries = _weather_for_day(weather_cities, day)
     if weather_entries:
@@ -422,13 +416,13 @@ def _draw_agenda_day(img: Image.Image, draw: ImageDraw.ImageDraw, day: date, eve
     max_rows = max(0, (y0 + h - MARGIN - y) // row_h)
 
     if not day_events:
-        draw_text(img, (text_x0, y), "Nothing scheduled", body_font, MUTED)
+        draw_text(img, (text_x0, y), "Nothing scheduled", body_font)
     for i, event in enumerate(day_events):
         if i >= max_rows:
-            draw_text(img, (text_x0, y), f"+{len(day_events) - max_rows} more", body_font, MUTED)
+            draw_text(img, (text_x0, y), f"+{len(day_events) - max_rows} more", body_font)
             break
         colors = _event_colors(event, owners_seen, palette_rgb)
-        _draw_color_bar(draw, text_x0, y + 2, text_x0 + 10, y + row_h - 7, colors, radius=3)
+        panel_style.draw_color_chip(draw, text_x0, y + 2, text_x0 + 10, y + row_h - 7, colors)
         time_str = "All day" if event["all_day"] else _fmt_time(_event_start(event, tz))
         prefix = f"{time_str}  "
         draw_text(img, (text_x0 + 18, y), prefix, body_font)
@@ -445,13 +439,13 @@ def _draw_tasks(img: Image.Image, draw: ImageDraw.ImageDraw, region: tuple[int,
     (`title`, truncated to fit -- TaskWidgetConfig.name or the "Tasks"
     default; the only widget type with its own on-panel title, since
     it's the only one where "which list is this" isn't obvious from its
-    content the way a calendar/photo/whiteboard's is), then a color bar
-    (reusing _event_colors/_draw_color_bar as-is: a task dict's
-    top-level owner_display_name/color_index is exactly _event_colors'
-    single-source fallback shape, since caldav_client.merge_tasks
-    doesn't cross-list-dedup tasks into a "sources" list the way
-    merge_events dedups events) + checkbox glyph + due date (if any) +
-    summary per task, same header/rule/row-cap/truncation shape as
+    content the way a calendar/photo/whiteboard's is), then a color chip
+    (reusing _event_colors/panel_style.draw_color_chip as-is: a task
+    dict's top-level owner_display_name/color_index is exactly
+    _event_colors' single-source fallback shape, since caldav_client.
+    merge_tasks doesn't cross-list-dedup tasks into a "sources" list the
+    way merge_events dedups events) + checkbox glyph + due date (if any)
+    + summary per task, same header/row-cap/truncation shape as
     _draw_agenda_day's event list so the standalone tasks widget (see
     _build_tasks) reads as the same consistent design as everything
     else on-panel, not a bolted-together look. Reuses _draw_mixed_line
@@ -460,45 +454,52 @@ def _draw_tasks(img: Image.Image, draw: ImageDraw.ImageDraw, region: tuple[int,
 
     Outstanding tasks get an empty checkbox; completed ones (only ever
     present when TaskWidgetConfig.show_completed is on -- see
-    caldav_client.fetch_tasks' completed_since) get a filled one and
-    muted text, no due-date prefix (irrelevant once done)."""
+    caldav_client.fetch_tasks' completed_since) get a filled checkbox in
+    this widget's own Green accent (see panel_style.THEME) -- that fill
+    is the "done" signal, no due-date prefix (irrelevant once done) and
+    no separate muted text treatment (see module-level MUTED removal
+    note above _event_colors)."""
     x0, y0, w, h = region
-    text_x0, text_y0 = x0 + MARGIN, y0 + MARGIN
+    header_h = title_font.size + 20
+    panel_style.draw_header_bar(draw, (x0, y0, w, header_h), header_h,
+                                panel_style.theme_color("tasks", palette_rgb))
+    text_x0 = x0 + MARGIN
     text_w = w - MARGIN * 2
-    draw_text(img, (text_x0, text_y0), _truncate_to_width(draw, title or "Tasks", title_font, text_w), title_font)
-    y = text_y0 + title_font.size + 12
-    draw.line([(text_x0, y), (text_x0 + text_w, y)], fill=RULE)
-    y += 12
+    draw_text(img, (text_x0, y0 + (header_h - title_font.size) // 2),
+             _truncate_to_width(draw, title or "Tasks", title_font, text_w), title_font, BG)
+    y = y0 + header_h + 12
 
     row_h = body_font.size + 14
     max_rows = max(0, (y0 + h - MARGIN - y) // row_h)
 
     if not tasks:
-        draw_text(img, (text_x0, y), "Nothing outstanding", body_font, MUTED)
+        draw_text(img, (text_x0, y), "Nothing outstanding", body_font)
         return
     owners_seen: list[str] = []
+    checkbox_fill = panel_style.theme_color("tasks", palette_rgb)
     for i, task in enumerate(tasks):
         if i >= max_rows:
-            draw_text(img, (text_x0, y), f"+{len(tasks) - max_rows} more", body_font, MUTED)
+            draw_text(img, (text_x0, y), f"+{len(tasks) - max_rows} more", body_font)
             break
         done = task.get("completed_at") is not None
         colors = _event_colors(task, owners_seen, palette_rgb)
-        _draw_color_bar(draw, text_x0, y + 2, text_x0 + 10, y + row_h - 7, colors, radius=3)
+        panel_style.draw_color_chip(draw, text_x0, y + 2, text_x0 + 10, y + row_h - 7, colors)
         box = body_font.size - 6
         box_x = text_x0 + 18
         box_y = y + (row_h - box) // 2 - 5
+        box_r = min(panel_style.CHIP_RADIUS, box // 2)
         if done:
-            draw.rectangle([box_x, box_y, box_x + box, box_y + box], fill=FG)
+            draw.rounded_rectangle([box_x, box_y, box_x + box, box_y + box], radius=box_r, fill=checkbox_fill)
         else:
-            draw.rectangle([box_x, box_y, box_x + box, box_y + box], outline=FG, width=2)
+            draw.rounded_rectangle([box_x, box_y, box_x + box, box_y + box], radius=box_r, outline=FG, width=2)
         text_x = box_x + box + 10
         due_str = None if done else _fmt_task_due(task.get("due"))
         prefix = f"{due_str}  " if due_str else ""
         if prefix:
-            draw_text(img, (text_x, y), prefix, body_font, MUTED)
+            draw_text(img, (text_x, y), prefix, body_font)
         prefix_w = draw.textlength(prefix, font=body_font) if prefix else 0
         _draw_mixed_line(img, draw, (round(text_x + prefix_w), y), task["summary"],
-                         body_font, text_w - (text_x - text_x0) - prefix_w, fill=MUTED if done else FG)
+                         body_font, text_w - (text_x - text_x0) - prefix_w)
         y += row_h
 
 
@@ -512,17 +513,16 @@ _AGENDA_FONTS = {"large": (34, 22, 20), "medium": (24, 22, 16), "small": (18, 16
 def _build_agenda(events: list[dict], browse_offset: int, target_w: int, target_h: int, tz: ZoneInfo,
                   palette_rgb: list | None = None, weather_cities: list[dict] | None = None,
                   weather_units: str = "fahrenheit") -> Image.Image:
-    img = Image.new("RGB", (target_w, target_h), BG)
-    draw = ImageDraw.Draw(img)
+    img, draw, region = panel_style.card_canvas(target_w, target_h)
 
     title_size, body_size, weather_size = _AGENDA_FONTS[_size_tier(target_w, target_h)]
-    title_font = ImageFont.load_default(size=title_size)
-    body_font = ImageFont.load_default(size=body_size)
-    weather_font = ImageFont.load_default(size=weather_size)
+    title_font = panel_style.font_bold(title_size)
+    body_font = panel_style.font_regular(body_size)
+    weather_font = panel_style.font_regular(weather_size)
 
     day = datetime.now(tz).date() + timedelta(days=browse_offset)
     owners_seen: list[str] = []
-    _draw_agenda_day(img, draw, day, events, tz, (0, 0, target_w, target_h), title_font, body_font, owners_seen,
+    _draw_agenda_day(img, draw, day, events, tz, region, title_font, body_font, owners_seen,
                      palette_rgb, weather_cities, weather_font, weather_units)
 
     return img
@@ -540,23 +540,22 @@ def _build_today_tomorrow(events: list[dict], browse_offset: int, target_w: int,
     shifts the whole two-day window together, same "days" unit
     _build_agenda already uses, so NEXT/BACK behaves identically across
     both views."""
-    img = Image.new("RGB", (target_w, target_h), BG)
-    draw = ImageDraw.Draw(img)
+    img, draw, (cx0, cy0, cw, ch) = panel_style.card_canvas(target_w, target_h)
 
     title_size, body_size, weather_size = _TODAY_TOMORROW_FONTS[_size_tier(target_w, target_h)]
-    title_font = ImageFont.load_default(size=title_size)
-    body_font = ImageFont.load_default(size=body_size)
-    weather_font = ImageFont.load_default(size=weather_size)
+    title_font = panel_style.font_bold(title_size)
+    body_font = panel_style.font_regular(body_size)
+    weather_font = panel_style.font_regular(weather_size)
 
     start_day = datetime.now(tz).date() + timedelta(days=browse_offset)
-    section_h = target_h // 2
+    section_h = ch // 2
     owners_seen: list[str] = []
     for i in range(2):
-        section_y0 = i * section_h
+        section_y0 = cy0 + i * section_h
         if i > 0:
-            draw.line([(MARGIN, section_y0), (target_w - MARGIN, section_y0)], fill=RULE)
+            draw.line([(cx0 + MARGIN, section_y0), (cx0 + cw - MARGIN, section_y0)], fill=RULE)
         _draw_agenda_day(img, draw, start_day + timedelta(days=i), events, tz,
-                         (0, section_y0, target_w, section_h), title_font, body_font, owners_seen,
+                         (cx0, section_y0, cw, section_h), title_font, body_font, owners_seen,
                          palette_rgb, weather_cities, weather_font, weather_units)
 
     return img
@@ -585,8 +584,7 @@ def _build_week(events: list[dict], browse_offset: int, target_w: int, target_h:
     otherwise "start of the week" doesn't mean much for an arbitrary day
     count, so it instead starts `start_offset` days from today (0 =
     today, see routers/api_widgets.py's api_widget_config_save)."""
-    img = Image.new("RGB", (target_w, target_h), BG)
-    draw = ImageDraw.Draw(img)
+    img, draw, (cx0, cy0, cw, ch) = panel_style.card_canvas(target_w, target_h)
     tier = _size_tier(target_w, target_h)
 
     today = datetime.now(tz).date()
@@ -599,36 +597,36 @@ def _build_week(events: list[dict], browse_offset: int, target_w: int, target_h:
 
     if layout == "vertical":
         title_base, body_base, weather_base = _WEEK_VERTICAL_FONTS[tier]
-        title_font = ImageFont.load_default(size=max(14, title_base - days))
-        body_font = ImageFont.load_default(size=max(11, body_base - days))
-        weather_font = ImageFont.load_default(size=max(9, weather_base - days))
-        section_h = target_h // days
+        title_font = panel_style.font_bold(max(14, title_base - days))
+        body_font = panel_style.font_regular(max(11, body_base - days))
+        weather_font = panel_style.font_regular(max(9, weather_base - days))
+        section_h = ch // days
         for i in range(days):
-            section_y0 = i * section_h
+            section_y0 = cy0 + i * section_h
             if i > 0:
-                draw.line([(MARGIN, section_y0), (target_w - MARGIN, section_y0)], fill=RULE)
+                draw.line([(cx0 + MARGIN, section_y0), (cx0 + cw - MARGIN, section_y0)], fill=RULE)
             day = week_first_day + timedelta(days=i)
-            _draw_agenda_day(img, draw, day, events, tz, (0, section_y0, target_w, section_h),
+            _draw_agenda_day(img, draw, day, events, tz, (cx0, section_y0, cw, section_h),
                              title_font, body_font, owners_seen, palette_rgb,
                              weather_cities, weather_font, weather_units)
         return img
 
     header_size, chip_size, weather_size = _WEEK_HORIZONTAL_FONTS[tier]
-    header_font = ImageFont.load_default(size=header_size)
-    chip_font = ImageFont.load_default(size=chip_size)
-    weather_font = ImageFont.load_default(size=weather_size)
-    col_w = (target_w - MARGIN * 2) // days
+    header_font = panel_style.font_bold(header_size)
+    chip_font = panel_style.font_regular(chip_size)
+    weather_font = panel_style.font_regular(weather_size)
+    col_w = (cw - MARGIN * 2) // days
     header_h = 44
 
     for col in range(days):
         day = week_first_day + timedelta(days=col)
-        x0 = MARGIN + col * col_w
+        x0 = cx0 + MARGIN + col * col_w
         if col > 0:
-            draw.line([(x0, MARGIN), (x0, target_h - MARGIN)], fill=RULE)
+            draw.line([(x0, cy0 + MARGIN), (x0, cy0 + ch - MARGIN)], fill=RULE)
         label = day.strftime("%a %-d") if day != today else f"* {day.strftime('%a %-d')}"
-        draw_text(img, (x0 + 6, MARGIN), _truncate_to_width(draw, label, header_font, col_w - 10), header_font)
+        draw_text(img, (x0 + 6, cy0 + MARGIN), _truncate_to_width(draw, label, header_font, col_w - 10), header_font)
 
-        y = MARGIN + header_h
+        y = cy0 + MARGIN + header_h
         # Columns are narrow, so only what actually fits gets drawn (see
         # weather_render.draw_weather_row) -- typically one city, no label
         # (the column itself makes which day it's for obvious; a city name
@@ -640,14 +638,14 @@ def _build_week(events: list[dict], browse_offset: int, target_w: int, target_h:
                                   icon_r=8, font=weather_font, units=weather_units, show_labels=False,
                                   palette_rgb=palette_rgb)
         row_h = chip_font.size + 10
-        max_rows = max(0, (target_h - MARGIN - y) // row_h)
+        max_rows = max(0, (cy0 + ch - MARGIN - y) // row_h)
         day_events = _events_on_day(events, day, tz)
         for i, event in enumerate(day_events):
             if i >= max_rows:
-                draw_text(img, (x0 + 6, y), f"+{len(day_events) - max_rows}", chip_font, MUTED)
+                draw_text(img, (x0 + 6, y), f"+{len(day_events) - max_rows}", chip_font)
                 break
             colors = _event_colors(event, owners_seen, palette_rgb)
-            _draw_color_bar(draw, x0 + 4, y + 1, x0 + 11, y + row_h - 5, colors, radius=2)
+            panel_style.draw_color_chip(draw, x0 + 4, y + 1, x0 + 11, y + row_h - 5, colors, radius=2)
             if event["all_day"]:
                 _draw_mixed_line(img, draw, (x0 + 16, y), event["summary"], chip_font, col_w - 20)
             else:
@@ -672,39 +670,60 @@ def _build_month(events: list[dict], browse_offset: int, target_w: int, target_h
                  week_start: int, palette_rgb: list | None = None) -> Image.Image:
     """Density dots per day, not literal event text -- real text at
     typical month-cell size (~100x70px) is close to unreadable on a
-    6-color dithered e-ink panel. Capped at 4 visible dots, "+N" beyond."""
-    img = Image.new("RGB", (target_w, target_h), BG)
-    draw = ImageDraw.Draw(img)
+    6-color dithered e-ink panel. Capped at 4 visible dots, "+N" beyond.
+    "Not in this month" day numbers used to be a muted gray -- now
+    de-emphasized by weight instead (Regular vs. Bold), same reasoning
+    as everywhere else this module dropped MUTED -- see module-level
+    comment above MARGIN/BG/FG."""
+    img, draw, (cx0, cy0, cw, ch) = panel_style.card_canvas(target_w, target_h)
 
     header_size, day_size = _MONTH_FONTS[_size_tier(target_w, target_h)]
-    header_font = ImageFont.load_default(size=header_size)
-    day_font = ImageFont.load_default(size=day_size)
+    header_font = panel_style.font_bold(header_size)
+    day_font_in_month = panel_style.font_bold(day_size)
+    day_font_out_of_month = panel_style.font_regular(day_size)
 
     today = datetime.now(tz).date()
     target_month = _add_months(date(today.year, today.month, 1), browse_offset)
     weeks = list(calendar_module.Calendar(firstweekday=week_start).monthdatescalendar(target_month.year, target_month.month))
 
-    col_w = (target_w - MARGIN * 2) // 7
+    col_w = (cw - MARGIN * 2) // 7
     header_h = 28
-    grid_top = MARGIN + header_h
-    row_h = (target_h - MARGIN - grid_top) // len(weeks)
+    grid_top = cy0 + MARGIN + header_h
+    row_h = (cy0 + ch - MARGIN - grid_top) // len(weeks)
+    today_accent = panel_style.theme_color("calendar", palette_rgb)
+    today_badge_r = min(panel_style.CHIP_RADIUS, 9)
 
     day_names = WEEKDAY_NAMES[week_start:] + WEEKDAY_NAMES[:week_start]
     for col, name in enumerate(day_names):
-        draw_text(img, (MARGIN + col * col_w + 6, MARGIN), name[:3], header_font, MUTED)
+        draw_text(img, (cx0 + MARGIN + col * col_w + 6, cy0 + MARGIN), name[:3], header_font)
 
     owners_seen: list[str] = []
     dot_r = 6
     for row, week in enumerate(weeks):
         for col, day in enumerate(week):
-            x0 = MARGIN + col * col_w
+            x0 = cx0 + MARGIN + col * col_w
             y0 = grid_top + row * row_h
             draw.rectangle([x0, y0, x0 + col_w, y0 + row_h], outline=RULE)
             in_month = day.month == target_month.month
-            text_color = FG if in_month else MUTED
             if day == today:
-                draw.rectangle([x0 + 2, y0 + 2, x0 + 24, y0 + 20], outline=FG)
-            draw_text(img, (x0 + 6, y0 + 4), str(day.day), day_font, text_color)
+                # A filled accent badge (this widget's own theme color,
+                # see panel_style.THEME) instead of the old bare outline
+                # -- an actual "today" indicator, not just an outline
+                # easy to miss at ~24px. Sized around the actual digit
+                # bbox (not a fixed pixel box) so a bold 2-digit day
+                # number ("30") fits as comfortably as a single digit
+                # ("3") at every size tier.
+                day_str = str(day.day)
+                text_x, text_y = x0 + 6, y0 + 4
+                dbbox = draw.textbbox((text_x, text_y), day_str, font=day_font_in_month)
+                pad = 3
+                badge_rect = [dbbox[0] - pad, dbbox[1] - pad, dbbox[2] + pad, dbbox[3] + pad]
+                badge_r = min(today_badge_r, (badge_rect[3] - badge_rect[1]) // 2)
+                draw.rounded_rectangle(badge_rect, radius=badge_r, fill=today_accent)
+                draw_text(img, (text_x, text_y), day_str, day_font_in_month, BG)
+            else:
+                day_font = day_font_in_month if in_month else day_font_out_of_month
+                draw_text(img, (x0 + 6, y0 + 4), str(day.day), day_font)
 
             day_events = _events_on_day(events, day, tz)
             dot_x = x0 + 8
@@ -718,7 +737,7 @@ def _build_month(events: list[dict], browse_offset: int, target_w: int, target_h
                 draw.ellipse([dot_x, dot_y, dot_x + dot_r * 2, dot_y + dot_r * 2], fill=event_color)
                 dot_x += dot_r * 2 + 5
             if len(day_events) > 4:
-                draw_text(img, (dot_x, dot_y - 2), f"+{len(day_events) - 4}", header_font, MUTED)
+                draw_text(img, (dot_x, dot_y - 2), f"+{len(day_events) - 4}", header_font)
 
     return img
 
@@ -759,8 +778,13 @@ def _build(events: list[dict], view: str, browse_offset: int, target_w: int, tar
                             weather_cities, weather_units)
 
     if fetch_summary:
-        font = ImageFont.load_default(size=14 if _size_tier(target_w, target_h) != "small" else 11)
-        draw_text(img, (MARGIN, target_h - MARGIN - font.size), fetch_summary, font, MUTED)
+        # Drawn as a final overlay onto the already-composited img (not
+        # inside any one _build_* branch above), so it offsets by
+        # panel_style.GUTTER itself to land inside the same visible
+        # margin every builder's own content already respects.
+        font = panel_style.font_regular(14 if _size_tier(target_w, target_h) != "small" else 11)
+        draw_text(img, (panel_style.GUTTER + MARGIN, target_h - panel_style.GUTTER - MARGIN - font.size),
+                 fetch_summary, font)
 
     return img
 
@@ -815,12 +839,11 @@ def _build_tasks(tasks: list[dict], target_w: int, target_h: int, palette_rgb: l
     """A tasks widget's entire region is the checklist -- unlike the old
     week-view slot, there's no day columns/header to share space with,
     so this is just _draw_tasks over the whole box."""
-    img = Image.new("RGB", (target_w, target_h), BG)
-    draw = ImageDraw.Draw(img)
+    img, draw, region = panel_style.card_canvas(target_w, target_h)
     title_size, body_size = _TASKS_FONTS[_size_tier(target_w, target_h)]
-    title_font = ImageFont.load_default(size=title_size)
-    body_font = ImageFont.load_default(size=body_size)
-    _draw_tasks(img, draw, (0, 0, target_w, target_h), tasks, title_font, body_font, palette_rgb, title)
+    title_font = panel_style.font_bold(title_size)
+    body_font = panel_style.font_regular(body_size)
+    _draw_tasks(img, draw, region, tasks, title_font, body_font, palette_rgb, title)
     return img
 
 

server/app/html_render.py

@@ -0,0 +1,571 @@
+"""Experimental "modern" render style, offered as an opt-in alternative
+to several widget types' hand-drawn PIL primitives: Jinja2 + a
+persistent headless Chromium browser (Playwright) -- see docs/widgets.md
+for the design rationale (gradients/shadows/soft shading that PIL can't
+easily do, at the cost of a real browser-process dependency). Everything
+in this module is shared infrastructure (the persistent browser, ordered
+dithering) plus one `build_*` function per widget type that has a
+modern-style builder -- battery/text/tasks/static image/whiteboard live
+here directly (mirroring how those widget types are themselves "inlined"
+in their own widget.py rather than getting a dedicated render module);
+calendar's (all four view modes, see calendar_html_render.py) is the one
+exception, kept separate the same reason calendar_render.py itself is
+its own 800+ line file rather than joining battery/text/tasks inline.
+Not offered for the photos widget -- a real photograph isn't a
+synthesized dashboard card, and photos has its own separate palette/
+dithering concern instead (see widgets/photos.py).
+
+Two things this module owns that nothing else in the codebase needed
+before:
+
+1. A **persistent** background browser process. Widget rendering already
+   happens concurrently across a fresh `ThreadPoolExecutor` per frame
+   request (routers/device.py's _render_widgets) -- Playwright's sync
+   API is thread-affine (an object must be used from the thread that
+   created it), so a single browser object can't be handed across those
+   ad-hoc worker threads, and relaunching a full Chromium process on
+   every widget render would be real, avoidable latency. Fix: one
+   background thread runs its own persistent asyncio event loop hosting
+   one long-lived `Browser`, lazily started on first use (see start()) --
+   not eagerly at server startup, so a deployment that never enables the
+   weather widget's "modern" style never launches Chromium at all and
+   never needs Playwright's browser binaries installed. main.py's
+   lifespan only wires up the *shutdown* half (stop()), so a clean
+   server restart doesn't leave an orphaned Chromium process behind if
+   this was ever actually used. render_html_to_image() is a plain sync
+   function any worker thread can call, bridging in via
+   `asyncio.run_coroutine_threadsafe` (the standard safe cross-thread
+   entry point into a *running* loop on another thread).
+
+2. **Per-region ordered (Bayer) dithering against the palette**, done
+   here rather than in the shared image_pipeline.py pipeline.
+   render_panel's whole-canvas single Floyd-Steinberg pass exists
+   because Floyd-Steinberg's error diffusion can't be split across
+   independently-quantized regions without a visible seam at the
+   boundary -- but that reasoning doesn't apply to ordered dithering,
+   which has no cross-pixel error term (each pixel's dither decision
+   only depends on its own position + color). So this module dithers its
+   own rendered widget to *already-exact* palette colors before
+   returning it; the later shared Floyd-Steinberg pass sees zero
+   quantization error there and leaves it untouched -- the same
+   "pre-commit to exact palette colors" trick image_pipeline.draw_text
+   and the hand-drawn weather icons already rely on, just reached a
+   different way. Floyd-Steinberg keeps working exactly as before for
+   photos and every other (classic-rendered) widget region.
+"""
+
+from __future__ import annotations
+
+import asyncio
+import io
+import threading
+from datetime import date
+from pathlib import Path
+
+import numpy as np
+from jinja2 import Environment, FileSystemLoader, select_autoescape
+from PIL import Image
+
+from . import panel_style, theme_tokens
+from .image_pipeline import DEFAULT_PALETTE_RGB, hex_to_rgb
+
+_TEMPLATE_DIR = Path(__file__).resolve().parent / "templates" / "widget_html"
+_FONT_DIR = Path(__file__).resolve().parent / "fonts"
+
+_jinja_env = Environment(
+    loader=FileSystemLoader(str(_TEMPLATE_DIR)),
+    autoescape=select_autoescape(["html", "jinja"]),
+)
+
+CATEGORY_EMOJI = {
+    "clear": "☀️",
+    "partly_cloudy": "⛅",
+    "cloudy": "☁️",
+    "fog": "\U0001f32b️",
+    "rain": "\U0001f327️",
+    "snow": "❄️",
+    "thunderstorm": "⛈️",
+}
+
+def _rgb_to_hex(rgb: tuple[int, int, int]) -> str:
+    return "#%02x%02x%02x" % tuple(rgb)
+
+
+def _darken_hex(rgb: tuple[int, int, int], factor: float = 0.75) -> str:
+    """A darker shade of `rgb` for a CSS gradient's second stop -- purely
+    decorative (ordered_dither commits everything to exact palette colors
+    regardless of which literal hex a gradient starts from)."""
+    return _rgb_to_hex(tuple(max(0, round(c * factor)) for c in rgb))
+
+
+# --- Persistent background browser -------------------------------------
+
+_loop: asyncio.AbstractEventLoop | None = None
+_loop_thread: threading.Thread | None = None
+_browser = None
+_playwright_cm = None
+_start_lock = threading.Lock()
+
+
+async def _launch_browser() -> None:
+    global _browser, _playwright_cm
+    from playwright.async_api import async_playwright
+
+    _playwright_cm = async_playwright()
+    playwright = await _playwright_cm.__aenter__()
+    _browser = await playwright.chromium.launch()
+
+
+async def _close_browser() -> None:
+    global _browser, _playwright_cm
+    if _browser is not None:
+        await _browser.close()
+        _browser = None
+    if _playwright_cm is not None:
+        await _playwright_cm.__aexit__(None, None, None)
+        _playwright_cm = None
+
+
+def start() -> None:
+    """Launches the background event loop + persistent Chromium browser,
+    if not already running. Called lazily by render_html_to_image on
+    first use (not from main.py's lifespan -- see module docstring for
+    why this must stay opt-in) -- exposed directly too, for tests that
+    want to control startup explicitly. Idempotent -- a second call
+    while already started is a no-op."""
+    global _loop, _loop_thread
+    if _loop is not None:
+        return
+    ready = threading.Event()
+
+    def _run() -> None:
+        global _loop
+        loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(loop)
+        _loop = loop
+        ready.set()
+        loop.run_forever()
+
+    _loop_thread = threading.Thread(target=_run, daemon=True, name="html-render-loop")
+    _loop_thread.start()
+    ready.wait()
+    asyncio.run_coroutine_threadsafe(_launch_browser(), _loop).result()
+
+
+def stop() -> None:
+    """Closes the browser and stops the background loop -- called from
+    main.py's lifespan shutdown so a server restart never leaves an
+    orphaned Chromium process behind. No-op if start() was never called
+    (the common case: most deployments never enable "modern" style)."""
+    global _loop, _loop_thread
+    if _loop is None:
+        return
+    asyncio.run_coroutine_threadsafe(_close_browser(), _loop).result()
+    _loop.call_soon_threadsafe(_loop.stop)
+    _loop_thread.join(timeout=5)
+    _loop = None
+    _loop_thread = None
+
+
+async def _screenshot(html: str, target_w: int, target_h: int) -> bytes:
+    page = await _browser.new_page(viewport={"width": target_w, "height": target_h}, device_scale_factor=1)
+    try:
+        await page.set_content(html, wait_until="networkidle")
+        return await page.screenshot()
+    finally:
+        await page.close()
+
+
+def render_html_to_image(html: str, target_w: int, target_h: int) -> Image.Image:
+    """Renders `html` (already sized to target_w x target_h via its own
+    <style>) through the persistent headless Chromium browser and
+    returns an RGB image of exactly that size. Safe to call from any
+    thread -- bridges into the dedicated background asyncio loop via
+    run_coroutine_threadsafe. Lazily calls start() on first use (see its
+    docstring) -- the first "modern" style render on a freshly-started
+    server pays Chromium's launch latency; every render after that reuses
+    the same persistent browser."""
+    if _loop is None:
+        with _start_lock:
+            if _loop is None:
+                start()
+    future = asyncio.run_coroutine_threadsafe(_screenshot(html, target_w, target_h), _loop)
+    png_bytes = future.result()
+    return Image.open(io.BytesIO(png_bytes)).convert("RGB")
+
+
+# --- Ordered (Bayer 8x8) dithering against an arbitrary palette ---------
+
+_BAYER8 = (
+    np.array(
+        [
+            [0, 32, 8, 40, 2, 34, 10, 42],
+            [48, 16, 56, 24, 50, 18, 58, 26],
+            [12, 44, 4, 36, 14, 46, 6, 38],
+            [60, 28, 52, 20, 62, 30, 54, 22],
+            [3, 35, 11, 43, 1, 33, 9, 41],
+            [51, 19, 59, 27, 49, 17, 57, 25],
+            [15, 47, 7, 39, 13, 45, 5, 37],
+            [63, 31, 55, 23, 61, 29, 53, 21],
+        ],
+        dtype=np.float32,
+    )
+    / 64.0
+    - 0.5
+)
+
+
+def ordered_dither(img: Image.Image, palette_rgb: list | None, amplitude: float = 48.0) -> Image.Image:
+    """Bayer-ordered dither of `img` against `palette_rgb` (falls back to
+    DEFAULT_PALETTE_RGB) -- every output pixel is one of the palette's
+    exact colors, spatially patterned rather than error-diffused, so it's
+    safe to run per-region before compositing (see module docstring for
+    why that's not true of Floyd-Steinberg). `amplitude` is the Bayer
+    bias's full swing in 0-255 RGB units before nearest-palette-color
+    matching -- 48 was the value this render style was tuned against in
+    the exploratory spike behind this feature; not exposed as a per-frame
+    setting (unlike dither_strength) since there's only one consumer of
+    it today."""
+    palette = np.array(palette_rgb or DEFAULT_PALETTE_RGB, dtype=np.float32)
+    arr = np.asarray(img.convert("RGB"), dtype=np.float32)
+    h, w, _ = arr.shape
+    tile = np.tile(_BAYER8, (h // 8 + 1, w // 8 + 1))[:h, :w]
+    biased = np.clip(arr + tile[:, :, None] * amplitude, 0, 255)
+    diffs = biased[:, :, None, :] - palette[None, None, :, :]
+    dists = np.einsum("hwkc,hwkc->hwk", diffs, diffs)
+    idx = np.argmin(dists, axis=2)
+    return Image.fromarray(palette[idx].astype(np.uint8), "RGB")
+
+
+def ordered_dither_regions(rendered: Image.Image, palette_rgb: list | None, base_amplitude: float = 48.0,
+                           accent_regions: list[tuple[tuple[int, int, int, int], float]] = ()) -> Image.Image:
+    """Like `ordered_dither`, but lets specific rectangles (e.g. a themed
+    header bar) dither at a higher amplitude than the rest of the widget.
+    A single higher amplitude applied to a whole widget washes out pale
+    content (a weather icon's white cloud body nearly disappeared in
+    testing); dithering the base image at the safe default and only
+    re-dithering an accent rect on top -- pasted back over the base --
+    lets a header carry a rich, arbitrary accent hue (via denser
+    stippling) without touching icon/text legibility elsewhere. Safe to
+    do per-region for the same reason `ordered_dither` is safe per-widget
+    (see its docstring): no cross-pixel error-diffusion term, so each
+    region's result depends only on its own pixels."""
+    base = ordered_dither(rendered, palette_rgb, amplitude=base_amplitude)
+    for (x0, y0, x1, y1), amplitude in accent_regions:
+        crop = rendered.crop((x0, y0, x1, y1))
+        base.paste(ordered_dither(crop, palette_rgb, amplitude=amplitude), (x0, y0))
+    return base
+
+
+# --- Weather "modern" style ----------------------------------------------
+
+def _day_label(day_date: date) -> str:
+    delta = (day_date - date.today()).days
+    if delta == 0:
+        return "Today"
+    if delta == 1:
+        return "Tomorrow"
+    return day_date.strftime("%a")
+
+
+def build_current(entry: dict | None, target_w: int, target_h: int, palette_rgb: list | None = None,
+                  units: str = "fahrenheit", city_label: str = "", theme_name: str | None = None) -> Image.Image:
+    """HTML/CSS-rendered analogue of weather_render.build_current --
+    same call signature, so app/widgets/weather.py can dispatch to
+    either interchangeably. Returns an already-palette-exact RGB image
+    (see ordered_dither). No header/accent region here (just a centered
+    icon+temp) -- theme-aware for font/radius only, plain ordered_dither
+    (no ordered_dither_regions call)."""
+    img = Image.new("RGB", (target_w, target_h), (255, 255, 255))
+    if not entry:
+        return img
+
+    theme = theme_tokens.resolve_theme(theme_name, "weather", palette_rgb)
+    unit_suffix = "F" if units == "fahrenheit" else "C"
+    icon_size = max(28, min(target_w, target_h) // 3)
+    template = _jinja_env.get_template("weather_current.html.jinja")
+    html = template.render(
+        w=target_w, h=target_h, gutter=panel_style.GUTTER, radius=theme["radius"],
+        font_regular=theme["font_regular"], font_bold=theme["font_bold"],
+        emoji=CATEGORY_EMOJI.get(entry["category"], ""),
+        temp=round(entry["temp"]), unit_suffix=unit_suffix, city_label=city_label,
+        icon_size=icon_size, temp_size=max(24, min(target_w, target_h) // 3),
+        label_size=max(12, icon_size // 3),
+    )
+    rendered = render_html_to_image(html, target_w, target_h)
+    return ordered_dither(rendered, palette_rgb)
+
+
+def build_daily(daily: dict[str, dict], target_w: int, target_h: int, palette_rgb: list | None = None,
+               units: str = "fahrenheit", city_label: str = "", theme_name: str | None = None) -> Image.Image:
+    """HTML/CSS-rendered analogue of weather_render.build_daily -- same
+    call signature. Returns an already-palette-exact RGB image (see
+    ordered_dither). Has a header bar -- dithered at the theme's
+    accent_amplitude via ordered_dither_regions, richer than the rest of
+    the widget (see that function's docstring for why)."""
+    img = Image.new("RGB", (target_w, target_h), (255, 255, 255))
+    days = list(daily.items())
+    if not days:
+        return img
+
+    theme = theme_tokens.resolve_theme(theme_name, "weather", palette_rgb)
+    unit_suffix = "F" if units == "fahrenheit" else "C"
+    header_h = max(28, min(target_w, target_h) // 8) if city_label else 0
+    col_w = max(1, target_w // len(days))
+    icon_size = max(16, min(col_w // 2, 36))
+    day_entries = [
+        {
+            "label": _day_label(date.fromisoformat(day_str)),
+            "emoji": CATEGORY_EMOJI.get(d["category"], ""),
+            "high": round(d["high"]),
+            "low": round(d["low"]),
+        }
+        for day_str, d in days
+    ]
+    template = _jinja_env.get_template("weather_daily.html.jinja")
+    html = template.render(
+        w=target_w, h=target_h, gutter=panel_style.GUTTER, radius=theme["radius"], shadow=theme["shadow"],
+        font_regular=theme["font_regular"], font_bold=theme["font_bold"],
+        city_label=city_label, header_h=header_h,
+        title_size=max(14, header_h - 12), accent_start=theme["accent_hex"], accent_end=theme["accent_hex_dark"],
+        days=day_entries, icon_size=icon_size, label_size=max(12, icon_size // 2),
+        unit_suffix=unit_suffix,
+    )
+    rendered = render_html_to_image(html, target_w, target_h)
+    if header_h <= 0:
+        return ordered_dither(rendered, palette_rgb)
+    gutter = panel_style.GUTTER
+    accent_rect = (gutter, gutter, target_w - gutter, gutter + header_h)
+    return ordered_dither_regions(rendered, palette_rgb, accent_regions=[(accent_rect, theme["accent_amplitude"])])
+
+
+SUPPORTED_MODES = ("current", "daily")
+
+
+def build(mode: str, data, target_w: int, target_h: int, palette_rgb: list | None = None,
+         units: str = "fahrenheit", city_label: str = "", theme_name: str | None = None) -> Image.Image:
+    """Dispatches to build_current/build_daily -- mirrors weather_render.
+    build()'s signature (minus interval_hours, which no modern-style mode
+    uses) so app/widgets/weather.py and the weather preview endpoint can
+    call either module identically. Only call this for mode in
+    SUPPORTED_MODES -- callers are expected to have already fallen back to
+    weather_render.build() for hourly/multi_city (see weather.py)."""
+    if mode == "current":
+        return build_current(data, target_w, target_h, palette_rgb, units, city_label, theme_name)
+    return build_daily(data, target_w, target_h, palette_rgb, units, city_label, theme_name)
+
+
+def render_weather_preview_png(mode: str, data, orientation: str, palette_rgb: list | None,
+                               units: str = "fahrenheit", city_label: str = "",
+                               theme_name: str | None = None) -> bytes:
+    """Modern-style analogue of weather_render.render_weather_preview_png
+    -- same browser-viewable-PNG convention every other widget's preview
+    endpoint uses. build()'s output is already palette-exact (see
+    ordered_dither), so the final _quantize pass here is a no-op on it,
+    same reasoning as the module docstring's compositing story."""
+    from .image_pipeline import _quantize, _png_bytes, logical_render_size
+
+    target_w, target_h = logical_render_size(orientation)
+    img = build(mode, data, target_w, target_h, palette_rgb, units, city_label, theme_name)
+    quantized = _quantize(img, palette_rgb, dither_strength=1.0)
+    return _png_bytes(quantized)
+
+
+# --- Battery "modern" style ------------------------------------------------
+
+def _battery_sizes(target_w: int, target_h: int, num_lines: int, scale: float) -> dict:
+    base = min(target_w, target_h)
+    icon_h = max(16, int(base // 3 * scale))
+    pct_size = max(14, int(base // 3 * scale))
+    line_size = max(9, int(base // 9 * scale))
+    gap = 8
+    total = icon_h + gap + pct_size + num_lines * (line_size + gap)
+    return {"icon_h": icon_h, "pct_size": pct_size, "line_size": line_size, "total": total}
+
+
+def build_battery(percent: int, lines: list[str], target_w: int, target_h: int,
+                  palette_rgb: list | None = None, theme_name: str | None = None) -> Image.Image:
+    """HTML/CSS-rendered analogue of widgets/battery.py's classic PIL
+    drawing -- same icon+percent+caption-lines shape, `lines` already
+    resolved by the caller (widgets/battery.py's _lines_for(), shared
+    with the classic path so the estimate/age formatting only lives in
+    one place). Returns an already-palette-exact RGB image (see
+    ordered_dither). Theme-aware for font/radius only -- the charge-level
+    fill_color below is a functional status signal (not a style choice)
+    and is never touched by a theme, and there's no header/accent region
+    to dither richer via ordered_dither_regions.
+
+    Shrinks icon/text sizes together (in 0.05 steps down to 0.3x) until
+    the whole stack actually fits the available height -- the classic
+    PIL path solves the same "icon + percent + 0-2 lines in a fixed box"
+    problem by truncating lines that don't fit; scaling down instead
+    keeps every resolved line visible, which reads better for a widget
+    that only ever has at most 2 short caption lines to begin with."""
+    avail_h = target_h - panel_style.GUTTER * 2
+    num_lines = len(lines)
+    scale = 1.0
+    sizes = _battery_sizes(target_w, target_h, num_lines, scale)
+    while sizes["total"] > avail_h and scale > 0.3:
+        scale -= 0.05
+        sizes = _battery_sizes(target_w, target_h, num_lines, scale)
+    # Extreme case (a 1x1-grid-cell-sized widget in "detailed" mode):
+    # scale bottomed out and it still doesn't fit -- drop the least
+    # important line rather than render overlapping text, same
+    # graceful-degradation idiom the classic PIL path's own
+    # `if y + small_font_size > ...: break` truncation already uses.
+    while sizes["total"] > avail_h and lines:
+        lines = lines[:-1]
+        num_lines = len(lines)
+        sizes = _battery_sizes(target_w, target_h, num_lines, scale)
+
+    theme = theme_tokens.resolve_theme(theme_name, "battery", palette_rgb)
+    fill_color = panel_style.battery_fill_color(percent, palette_rgb)
+    icon_h = sizes["icon_h"]
+    icon_w = int(icon_h * 1.8)
+    stroke = max(2, icon_h // 12)
+    nub_w = max(3, icon_w // 10)
+    template = _jinja_env.get_template("battery.html.jinja")
+    html = template.render(
+        w=target_w, h=target_h, gutter=panel_style.GUTTER, radius=theme["radius"],
+        font_regular=theme["font_regular"], font_bold=theme["font_bold"], percent=percent, lines=lines,
+        icon_w=icon_w, icon_h=icon_h, icon_radius=icon_h // 6, stroke=stroke,
+        fill_pct=max(0, min(100, percent)), fill_radius=max(0, icon_h // 6 - stroke),
+        fill_color=_rgb_to_hex(fill_color), fill_color_dark=_darken_hex(fill_color),
+        nub_w=nub_w, nub_h=icon_h // 2, nub_radius=max(1, nub_w // 3),
+        pct_size=sizes["pct_size"], line_size=sizes["line_size"],
+    )
+    rendered = render_html_to_image(html, target_w, target_h)
+    return ordered_dither(rendered, palette_rgb)
+
+
+# --- Text "modern" style ---------------------------------------------------
+
+def build_text(cfg, target_w: int, target_h: int, palette_rgb: list | None = None,
+              theme_name: str | None = None) -> Image.Image:
+    """HTML/CSS-rendered analogue of widgets/text.py's classic PIL
+    drawing. Reuses widgets/text.py's own `_fit()` for the one piece of
+    logic CSS has no native equivalent for (shrink-to-fit sizing) --
+    `_fit` measures against the exact same vendored font files via PIL,
+    so the resolved size is a real fit decision, not a guess -- but lets
+    the browser do its own text wrapping/line-breaking at that size
+    (paragraphs/runs passed through directly as HTML) rather than
+    replicating `_fit`'s own word-wrapped line list; the two wrapping
+    algorithms can disagree on exact break points, an acceptable
+    approximation since this style only needs to look good and fit
+    reasonably, not be pixel-identical to classic. Returns an already-
+    palette-exact RGB image (see ordered_dither).
+
+    theme_name is accepted (every modern-style build_* function takes
+    one, threaded uniformly from frame.theme) but deliberately unused --
+    the text widget's own font_family is a per-widget, user-authored
+    choice (see widgets/text.py's module docstring), same carve-out
+    reasoning as run-level colors; a frame theme overriding it would
+    silently undo an explicit user choice. text.html.jinja also has no
+    card chrome (no radius/shadow) for a theme to touch."""
+    from PIL import ImageDraw
+
+    from . import widgets  # local import: heavy-ish, and only "modern" text needs it
+
+    text_widget = widgets.text
+    bg_rgb = (hex_to_rgb(cfg.background_color) if cfg.background_color else None) or (255, 255, 255)
+    family = cfg.font_family if cfg.font_family in text_widget.FONT_FAMILIES else text_widget.DEFAULT_FONT_FAMILY
+    paragraphs = cfg.content or []
+    margin = text_widget.MARGIN
+    max_width = max(10, target_w - 2 * margin)
+    max_height = max(10, target_h - 2 * margin)
+
+    measure_img = Image.new("RGB", (1, 1))
+    draw = ImageDraw.Draw(measure_img)
+    size, _lines = text_widget._fit(draw, paragraphs, family, cfg.font_size, max_width, max_height)
+
+    files = text_widget._FONT_FILES.get(family) or text_widget._FONT_FILES[text_widget.DEFAULT_FONT_FAMILY]
+    align = cfg.align if cfg.align in ("left", "center", "right") else "left"
+    template = _jinja_env.get_template("text.html.jinja")
+    html = template.render(
+        w=target_w, h=target_h, margin=margin, bg_color=_rgb_to_hex(bg_rgb),
+        size=size, line_height=text_widget.LINE_HEIGHT_FACTOR, align=align,
+        font_regular=str(_FONT_DIR / files[(False, False)]), font_bold=str(_FONT_DIR / files[(True, False)]),
+        font_italic=str(_FONT_DIR / files[(False, True)]), font_bold_italic=str(_FONT_DIR / files[(True, True)]),
+        paragraphs=paragraphs,
+    )
+    rendered = render_html_to_image(html, target_w, target_h)
+    return ordered_dither(rendered, palette_rgb)
+
+
+# --- Tasks "modern" style ---------------------------------------------------
+
+def build_tasks(tasks: list[dict], target_w: int, target_h: int, palette_rgb: list | None = None,
+                title: str = "Tasks", theme_name: str | None = None) -> Image.Image:
+    """HTML/CSS-rendered analogue of calendar_render._build_tasks --
+    same header+checklist shape. Reuses calendar_render's own
+    _event_colors/_fmt_task_due (the exact color-dedup/due-date-format
+    logic the classic renderer uses) so a task's color chip/due string
+    matches classic style exactly; only the drawing differs -- and a
+    theme's accent never touches those per-owner chip colors (identity-
+    coding, not style). Has a header bar -- dithered at the theme's
+    accent_amplitude via ordered_dither_regions. Returns an already-
+    palette-exact RGB image (see ordered_dither)."""
+    from .calendar_render import _event_colors, _fmt_task_due
+
+    theme = theme_tokens.resolve_theme(theme_name, "tasks", palette_rgb)
+    header_h = max(28, min(target_w, target_h) // 8)
+    body_size = max(11, min(target_w, target_h) // 20)
+    row_h = body_size + 14
+    box_size = max(10, body_size - 4)
+    avail_h = target_h - header_h - 16
+    max_rows = max(0, avail_h // row_h)
+
+    owners_seen: list[str] = []
+    rows = []
+    for task in tasks[:max_rows]:
+        colors = _event_colors(task, owners_seen, palette_rgb)
+        done = task.get("completed_at") is not None
+        due = None if done else (_fmt_task_due(task.get("due")) or None)
+        rows.append({
+            "colors": [_rgb_to_hex(c) for c in colors],
+            "done": done,
+            "due": due,
+            "summary": task["summary"],
+        })
+    more_count = max(0, len(tasks) - max_rows)
+
+    template = _jinja_env.get_template("tasks.html.jinja")
+    html = template.render(
+        w=target_w, h=target_h, gutter=panel_style.GUTTER, radius=theme["radius"], shadow=theme["shadow"],
+        font_regular=theme["font_regular"], font_bold=theme["font_bold"],
+        title=title, header_h=header_h, title_size=max(14, header_h - 12),
+        accent_start=theme["accent_hex"], accent_end=theme["accent_hex_dark"],
+        rows=rows, more_count=more_count, row_h=row_h, box_size=box_size, body_size=body_size,
+    )
+    rendered = render_html_to_image(html, target_w, target_h)
+    gutter = panel_style.GUTTER
+    accent_rect = (gutter, gutter, target_w - gutter, gutter + header_h)
+    return ordered_dither_regions(rendered, palette_rgb, accent_regions=[(accent_rect, theme["accent_amplitude"])])
+
+
+# --- Static image / whiteboard "modern" style (shared) ---------------------
+
+def build_framed_image(composed: Image.Image, target_w: int, target_h: int,
+                       palette_rgb: list | None = None, theme_name: str | None = None,
+                       widget_kind: str = "static") -> Image.Image:
+    """Wraps an already-composed image (static_image.py/whiteboard.py's
+    own compose_into() output, exactly target_w x target_h, already
+    cropped/fit per that widget's own display_mode) in a rounded-corner,
+    shadowed card -- the first visual chrome either widget type has ever
+    had (both currently draw with zero chrome of their own). Theme-aware
+    for radius/shadow only -- no text/header content to accent or font.
+    Returns an already-palette-exact RGB image (see ordered_dither)."""
+    import base64
+
+    theme = theme_tokens.resolve_theme(theme_name, widget_kind, palette_rgb)
+    buf = io.BytesIO()
+    composed.convert("RGB").save(buf, format="PNG")
+    image_b64 = base64.b64encode(buf.getvalue()).decode("ascii")
+
+    template = _jinja_env.get_template("framed_image.html.jinja")
+    html = template.render(
+        w=target_w, h=target_h, gutter=panel_style.GUTTER, radius=theme["radius"], shadow=theme["shadow"],
+        image_b64=image_b64,
+    )
+    rendered = render_html_to_image(html, target_w, target_h)
+    return ordered_dither(rendered, palette_rgb)

server/app/image_pipeline.py

@@ -61,7 +61,8 @@ def _dotted_edge(draw: ImageDraw.ImageDraw, x0: float, y0: float, x1: float, y1:
         pos += spacing
 
 
-def draw_widget_border(img: Image.Image, style: str, thickness: int, color: tuple[int, int, int]) -> None:
+def draw_widget_border(img: Image.Image, style: str, thickness: int, color: tuple[int, int, int],
+                       radius: int = 0) -> None:
     """Draws a border inset within img's own bounds, mutating it in
     place -- called once per widget's own region (routers/device.py's
     _render_widgets, and each widget type's own dialog preview) before
@@ -74,24 +75,44 @@ def draw_widget_border(img: Image.Image, style: str, thickness: int, color: tupl
     "solid"/"dashed"/"dotted" are a single thickness-px stroke traced
     just inside the image's edge; "fancy" is two thinner concentric
     strokes with a gap between them, picture-frame-mat style. "none" (or
-    a non-positive thickness) draws nothing."""
+    a non-positive thickness) draws nothing. `radius` is opt-in and only
+    honored by "solid"/"fancy" (rounded_rectangle instead of rectangle) --
+    "dashed"/"dotted" trace each of the 4 edges as independent straight
+    segments (see _dashed_edge/_dotted_edge) and ignore it, a documented
+    limitation rather than a bug. Defaults to 0 (unchanged sharp-corner
+    behavior) and no call site passes non-zero today -- this ships the
+    capability for a future per-widget "rounded border" setting without
+    changing default behavior anywhere (see tests/test_widget_border.py's
+    exact-corner-pixel assertions)."""
     if style == "none" or thickness <= 0:
         return
     w, h = img.size
     t = max(1, min(int(thickness), min(w, h) // 2))
     draw = ImageDraw.Draw(img)
+    r = max(0, min(radius, (w - 1) // 2, (h - 1) // 2))
 
     if style == "fancy":
         line_t = max(1, t // 3)
         gap = max(2, t - 2 * line_t)
-        draw.rectangle([0, 0, w - 1, h - 1], outline=color, width=line_t)
+        if r:
+            draw.rounded_rectangle([0, 0, w - 1, h - 1], radius=r, outline=color, width=line_t)
+        else:
+            draw.rectangle([0, 0, w - 1, h - 1], outline=color, width=line_t)
         inset = line_t + gap
         if w - 2 * inset > 1 and h - 2 * inset > 1:
-            draw.rectangle([inset, inset, w - 1 - inset, h - 1 - inset], outline=color, width=line_t)
+            inner_r = max(0, min(r - inset, (w - 1 - 2 * inset) // 2, (h - 1 - 2 * inset) // 2)) if r else 0
+            if inner_r:
+                draw.rounded_rectangle([inset, inset, w - 1 - inset, h - 1 - inset], radius=inner_r,
+                                       outline=color, width=line_t)
+            else:
+                draw.rectangle([inset, inset, w - 1 - inset, h - 1 - inset], outline=color, width=line_t)
         return
 
     if style == "solid":
-        draw.rectangle([0, 0, w - 1, h - 1], outline=color, width=t)
+        if r:
+            draw.rounded_rectangle([0, 0, w - 1, h - 1], radius=r, outline=color, width=t)
+        else:
+            draw.rectangle([0, 0, w - 1, h - 1], outline=color, width=t)
         return
 
     # dashed/dotted trace the same centered-on-the-edge path solid/
@@ -166,6 +187,27 @@ DEFAULT_PALETTE_RGB = [
 
 PALETTE_LABELS = ["Black", "White", "Yellow", "Red", "Blue", "Green"]
 
+# A community-measured alternative starting point for the same 6 slots,
+# ported (data only, not code) from paperlesspaper/epdoptimize's
+# src/dither/data/default-palettes.json "spectra6" entry (Apache
+# License 2.0, https://github.com/paperlesspaper/epdoptimize) -- offered
+# as a one-click "Load calibrated preset" in the Advanced configuration
+# UI, not a new default: unlike DEFAULT_PALETTE_RGB above, these are an
+# actual panel's measured appearance rather than idealized primaries
+# (real Spectra 6 white/black are notably duller than pure #fff/#000),
+# but measured from a different unit than any given frame's actual
+# panel -- panel_style.py's own docstring already notes units vary
+# enough to be worth calibrating per frame, and this hasn't been
+# verified against this project's own hardware.
+CALIBRATED_SPECTRA6_RGB = [
+    (0x1F, 0x22, 0x26),  # BLACK
+    (0xB9, 0xC7, 0xC9),  # WHITE
+    (0xC1, 0xBB, 0x1E),  # YELLOW
+    (0x62, 0x20, 0x1E),  # RED
+    (0x23, 0x3F, 0x8E),  # BLUE
+    (0x35, 0x56, 0x3A),  # GREEN
+]
+
 # The panel's actual 4-bit color codes (see firmware/components/epd7in3e),
 # in the same order as DEFAULT_PALETTE_RGB/PALETTE_LABELS -- fixed by the
 # hardware protocol, never user-configurable. 0x4 is intentionally unused
@@ -496,9 +538,16 @@ def render_frame(source: Image.Image, faces: list[dict] | None = None,
     return _transpose_and_pack(quantized, orientation)
 
 
+def _png_bytes(img: Image.Image) -> bytes:
+    buf = io.BytesIO()
+    img.convert("RGB").save(buf, format="PNG")
+    return buf.getvalue()
+
+
 def render_panel(regions: list[tuple[tuple[int, int, int, int], Image.Image]], orientation: str = "landscape",
                  palette_rgb: list | None = None, color_boost: float = 1.0, contrast_boost: float = 1.0,
-                 dither_strength: float = 1.0, manage: dict | None = None, as_png: bool = False) -> bytes:
+                 dither_strength: float = 1.0, manage: dict | None = None, as_png: bool = False,
+                 capture_snapshot: bool = False) -> bytes | tuple[bytes, bytes]:
     """The widget system's compositor -- generalizes render_frame's tail
     (paste, enhance once, overlay once, quantize once, pack once) from
     "compose one photo" to "paste N already-rendered regions, then run
@@ -530,7 +579,14 @@ def render_panel(regions: list[tuple[tuple[int, int, int, int], Image.Image]], o
     as_png=True returns a normal browser-viewable PNG in logical (upright)
     orientation instead of packed native-panel bytes, same convention as
     render_preview_png -- used for the web UI's live "how it's displaying"
-    thumbnail."""
+    thumbnail.
+
+    capture_snapshot=True (only meaningful alongside as_png=False) returns
+    (packed_bytes, png_bytes) instead of just packed_bytes -- both derived
+    from the same already-quantized canvas, so a device-facing render can
+    also persist a browser-viewable copy (see routers/device.py's
+    _record_last_displayed) without re-running composition/quantization a
+    second time."""
     logical_w, logical_h = logical_render_size(orientation)
     canvas = Image.new("RGB", (logical_w, logical_h), LETTERBOX_BG)
     for (x, y, w, h), region_img in regions:
@@ -540,10 +596,11 @@ def render_panel(regions: list[tuple[tuple[int, int, int, int], Image.Image]], o
     fitted = _apply_manage_overlay(fitted, manage)
     quantized = _quantize(fitted, palette_rgb, dither_strength)
     if as_png:
-        buf = io.BytesIO()
-        quantized.convert("RGB").save(buf, format="PNG")
-        return buf.getvalue()
-    return _transpose_and_pack(quantized, orientation)
+        return _png_bytes(quantized)
+    packed = _transpose_and_pack(quantized, orientation)
+    if capture_snapshot:
+        return packed, _png_bytes(quantized)
+    return packed
 
 
 def render_preview_png(source: Image.Image, faces: list[dict] | None = None,
@@ -559,14 +616,13 @@ def render_preview_png(source: Image.Image, faces: list[dict] | None = None,
     fitted = _enhance(_compose(source, faces, orientation, display_mode), color_boost, contrast_boost)
     fitted = _apply_manage_overlay(fitted, manage)
     quantized = _quantize(fitted, palette_rgb, dither_strength)
-    buf = io.BytesIO()
-    quantized.convert("RGB").save(buf, format="PNG")
-    return buf.getvalue()
+    return _png_bytes(quantized)
 
 
 def render_placeholder(lines: list[str], qr_url: str | None = None,
                        orientation: str = "landscape", palette_rgb: list | None = None,
-                       manage: dict | None = None, as_png: bool = False) -> bytes:
+                       manage: dict | None = None, as_png: bool = False,
+                       capture_snapshot: bool = False) -> bytes | tuple[bytes, bytes]:
     """A readable full-panel message (plus an optional QR code) in the
     same packed format as render_frame -- what /frame/image serves for a
     frame that isn't claimed or configured yet, so a fresh device shows
@@ -574,7 +630,8 @@ def render_placeholder(lines: list[str], qr_url: str | None = None,
 
     `manage`, same as render_frame's -- lets the manage button still work
     (at minimum, the scan-to-manage QR) on a frame that isn't configured
-    yet."""
+    yet. `capture_snapshot`, same as render_panel's -- (packed, png)
+    instead of just packed."""
     margin = 24
     logical_w, logical_h = logical_render_size(orientation)
     img = Image.new("RGB", (logical_w, logical_h), (255, 255, 255))
@@ -638,7 +695,8 @@ def render_placeholder(lines: list[str], qr_url: str | None = None,
     img = _apply_manage_overlay(img, manage)
     quantized = _quantize(img, palette_rgb, dither_strength=1.0)
     if as_png:
-        buf = io.BytesIO()
-        quantized.convert("RGB").save(buf, format="PNG")
-        return buf.getvalue()
-    return _transpose_and_pack(quantized, orientation)
+        return _png_bytes(quantized)
+    packed = _transpose_and_pack(quantized, orientation)
+    if capture_snapshot:
+        return packed, _png_bytes(quantized)
+    return packed

server/app/logging_setup.py

@@ -0,0 +1,34 @@
+"""Root-logger configuration: a rotating file handler under the same
+/data volume as the sqlite DB and legacy config.json, so the admin log
+viewer has something to read and log content survives container
+restarts -- a redeploy happens on every push to main touching
+server/**, which would make an in-memory-only log buffer nearly
+useless in practice. Before this, the root logger had no handler at
+all, so every module's logger.info() call (user creation, claims,
+password resets, ...) was silently dropped rather than merely
+un-viewable -- this fixes that too, not just adds a viewer."""
+
+from __future__ import annotations
+
+import logging
+import os
+from logging.handlers import RotatingFileHandler
+from pathlib import Path
+
+LOG_PATH = Path(os.environ.get("LOG_PATH", "/data/server.log"))
+
+
+def configure_logging() -> None:
+    LOG_PATH.parent.mkdir(parents=True, exist_ok=True)
+    handler = RotatingFileHandler(LOG_PATH, maxBytes=2_000_000, backupCount=3)
+    handler.setFormatter(logging.Formatter("%(asctime)s %(levelname)s %(name)s: %(message)s"))
+    root = logging.getLogger()
+    root.addHandler(handler)
+    root.setLevel(os.environ.get("LOG_LEVEL", "INFO"))
+
+
+def read_log_tail(lines: int) -> str:
+    if not LOG_PATH.exists():
+        return ""
+    text = LOG_PATH.read_text(errors="replace")
+    return "\n".join(text.splitlines()[-lines:])

server/app/main.py

@@ -16,14 +16,16 @@ pre-database config.json deployment on first boot."""
 from __future__ import annotations
 
 import logging
+import time
+from contextlib import asynccontextmanager
 
 from fastapi import FastAPI, Request
-from fastapi.responses import HTMLResponse, RedirectResponse
+from fastapi.responses import FileResponse, HTMLResponse, RedirectResponse
 from fastapi.staticfiles import StaticFiles
 from fastapi.templating import Jinja2Templates
 from sqlalchemy import select
 
-from . import migration
+from . import html_render, logging_setup, migration
 from .auth import (
     browser_token_valid,
     current_user,
@@ -38,12 +40,53 @@ from .routers.common import shell_context
 
 logger = logging.getLogger(__name__)
 
+# Before anything else logs: a handler exists to catch it, and it lands in
+# the same persistent volume the admin log viewer reads from.
+logging_setup.configure_logging()
+
 # Schema + legacy-config import, before the first request is served.
 migration.run_migrations()
 
-app = FastAPI(title="ESPresso Frame Server")
+@asynccontextmanager
+async def _lifespan(app: FastAPI):
+    """Startup does nothing browser-related -- html_render.start() is
+    lazy (only the weather widget's opt-in "modern" render style ever
+    triggers it, see that module's docstring), so a deployment that
+    never uses it never launches Chromium or needs Playwright's browser
+    binaries installed. Shutdown calls html_render.stop() unconditionally
+    (a no-op if it was never started) so a server restart never leaves
+    an orphaned Chromium process running."""
+    yield
+    html_render.stop()
+
+
+app = FastAPI(title="ESPresso Frame Server", lifespan=_lifespan)
 templates = Jinja2Templates(directory="app/templates")
 
+
+@app.middleware("http")
+async def log_device_requests(request: Request, call_next):
+    """Access log for the firmware-facing /frame/* protocol -- the admin
+    log viewer otherwise only ever shows exceptions (device.py logs
+    those, not successful requests), so a slow-but-200 request or a
+    device hammering a stale/wrong token leaves no trace at all. Logs
+    the device id (query param, not the token -- never log credentials)
+    and wall time, which is exactly what's needed to spot a request that
+    blew past the firmware's fixed HTTP timeout without technically
+    failing server-side."""
+    if not request.url.path.startswith("/frame/"):
+        return await call_next(request)
+    start = time.monotonic()
+    device_id = request.query_params.get("id", "") or "-"
+    response = await call_next(request)
+    elapsed_ms = (time.monotonic() - start) * 1000
+    logger.info(
+        "%s %s id=%s -> %d (%.0fms)",
+        request.method, request.url.path, device_id, response.status_code, elapsed_ms,
+    )
+    return response
+
+
 app.mount("/static", StaticFiles(directory="app/static"), name="static")
 
 app.include_router(device.router)
@@ -60,6 +103,13 @@ def health() -> dict:
     return {"status": "ok"}
 
 
+@app.get("/sw.js")
+def service_worker() -> FileResponse:
+    # Served from / rather than /static/sw.js so its default scope is the
+    # whole app -- a SW can only ever control paths at or below its own URL.
+    return FileResponse("app/static/sw.js", media_type="application/javascript")
+
+
 def _device_credential_redirect(request: Request, db, allow_legacy: bool) -> str | None:
     """The on-frame manage QR points at the server root with the device's
     own credentials (new firmware: ?id=&token=; deployed firmware:

server/app/manage_overlay.py

@@ -14,7 +14,8 @@ from __future__ import annotations
 
 from PIL import Image, ImageDraw, ImageFont
 
-from .image_pipeline import DEFAULT_PALETTE_RGB, draw_text
+from . import panel_style
+from .image_pipeline import draw_text
 
 PADDING = 16
 QR_TEXT_GAP = 8
@@ -27,9 +28,12 @@ BODY_FONT_SIZE = 20
 
 BATTERY_ICON_W = 40
 BATTERY_ICON_H = 22
-BATTERY_ICON_STROKE = 2
+# Stroke/nub width/height are no longer fixed constants here -- panel_
+# style.draw_battery_icon derives them from icon_w/icon_h itself (same
+# formula widgets/battery.py's own icon already used). BATTERY_NUB_W
+# below is kept only as this box's own outer-width estimate, not fed
+# into the icon drawing itself.
 BATTERY_NUB_W = 5
-BATTERY_NUB_H = 10
 BATTERY_ICON_TEXT_GAP = 8
 BATTERY_REGION_GAP = 8  # vertical gap below the manage QR box
 
@@ -37,10 +41,6 @@ FACE_LABEL_PADDING = 8
 FACE_LABEL_GAP = 4  # distance from the face's anchor point to the label box
 
 
-def _font(size: int) -> ImageFont.ImageFont:
-    return ImageFont.load_default(size=size)
-
-
 def _qr_image(url: str, target_px: int = QR_TARGET_PX) -> Image.Image:
     import qrcode
 
@@ -52,7 +52,7 @@ def _qr_image(url: str, target_px: int = QR_TARGET_PX) -> Image.Image:
     return raw.resize((raw.width * scale, raw.height * scale), Image.NEAREST)
 
 
-def _text_box(draw: ImageDraw.ImageDraw, lines: list[str], font: ImageFont.ImageFont) -> tuple[int, int]:
+def _text_box(draw: ImageDraw.ImageDraw, lines: list[str], font: ImageFont.FreeTypeFont) -> tuple[int, int]:
     """(width, height) of `lines` stacked with LINE_GAP between them, at
     `font` -- the box _draw_text_box below will need."""
     w = 0
@@ -64,7 +64,7 @@ def _text_box(draw: ImageDraw.ImageDraw, lines: list[str], font: ImageFont.Image
     return w, h
 
 
-def _draw_centered_lines(img: Image.Image, draw: ImageDraw.ImageDraw, lines: list[str], font: ImageFont.ImageFont,
+def _draw_centered_lines(img: Image.Image, draw: ImageDraw.ImageDraw, lines: list[str], font: ImageFont.FreeTypeFont,
                          center_x: int, top: int) -> None:
     y = top
     for line in lines:
@@ -82,7 +82,8 @@ def _draw_qr_box(img: Image.Image, draw: ImageDraw.ImageDraw, url: str, caption:
     (the battery, below the manage QR) use it instead of recomputing the
     same geometry a second time."""
     qr_img = _qr_image(url)
-    text_w, text_h = _text_box(draw, caption, _font(TITLE_FONT_SIZE)) if caption else (0, 0)
+    caption_font = panel_style.font_bold(TITLE_FONT_SIZE)
+    text_w, text_h = _text_box(draw, caption, caption_font) if caption else (0, 0)
     content_w = max(qr_img.width, text_w)
     content_h = qr_img.height + (QR_TEXT_GAP + text_h if caption else 0)
 
@@ -90,24 +91,26 @@ def _draw_qr_box(img: Image.Image, draw: ImageDraw.ImageDraw, url: str, caption:
     h = content_h + PADDING * 2
     x0, y0 = _corner_origin(img.size, (w, h), corner)
 
-    draw.rectangle([x0, y0, x0 + w, y0 + h], fill=(255, 255, 255), outline=(0, 0, 0))
+    draw.rounded_rectangle([x0, y0, x0 + w, y0 + h], radius=panel_style.CHIP_RADIUS,
+                           fill=(255, 255, 255), outline=(0, 0, 0))
     center_x = x0 + w // 2
     img.paste(qr_img, (center_x - qr_img.width // 2, y0 + PADDING))
     if caption:
-        _draw_centered_lines(img, draw, caption, _font(TITLE_FONT_SIZE), center_x, y0 + PADDING + qr_img.height + QR_TEXT_GAP)
+        _draw_centered_lines(img, draw, caption, caption_font, center_x, y0 + PADDING + qr_img.height + QR_TEXT_GAP)
     return x0, y0, w, h
 
 
 def _draw_text_box(img: Image.Image, draw: ImageDraw.ImageDraw, lines: list[str], corner: str) -> None:
     """White-padded box with centered text lines, placed in one of the
     panel's four corners."""
-    font = _font(BODY_FONT_SIZE)
+    font = panel_style.font_regular(BODY_FONT_SIZE)
     text_w, text_h = _text_box(draw, lines, font)
     w = text_w + PADDING * 2
     h = text_h + PADDING * 2
     x0, y0 = _corner_origin(img.size, (w, h), corner)
 
-    draw.rectangle([x0, y0, x0 + w, y0 + h], fill=(255, 255, 255), outline=(0, 0, 0))
+    draw.rounded_rectangle([x0, y0, x0 + w, y0 + h], radius=panel_style.CHIP_RADIUS,
+                           fill=(255, 255, 255), outline=(0, 0, 0))
     _draw_centered_lines(img, draw, lines, font, x0 + w // 2, y0 + PADDING)
 
 
@@ -123,34 +126,17 @@ def _corner_origin(img_size: tuple[int, int], box_size: tuple[int, int], corner:
     return img_w - PANEL_MARGIN - box_w, img_h - PANEL_MARGIN - box_h  # bottom-right
 
 
-# DEFAULT_PALETTE_RGB order is [BLACK, WHITE, YELLOW, RED, BLUE, GREEN]
-# (see image_pipeline.PANEL_CODES) -- picked by level so the fill itself
-# carries the "how worried should I be" signal, not just the number next
-# to it. Thresholds match the low-battery-alert spirit elsewhere in this
-# project (not tied to a frame's own configured alert threshold, since
-# this glyph has to make sense with no configuration at all).
-_BATTERY_LOW = DEFAULT_PALETTE_RGB[3]  # red
-_BATTERY_MEDIUM = DEFAULT_PALETTE_RGB[2]  # yellow
-_BATTERY_HIGH = DEFAULT_PALETTE_RGB[5]  # green
-
-
-def _battery_fill_color(percent: int) -> tuple[int, int, int]:
-    if percent <= 15:
-        return _BATTERY_LOW
-    if percent <= 40:
-        return _BATTERY_MEDIUM
-    return _BATTERY_HIGH
-
-
 def _draw_battery(img: Image.Image, draw: ImageDraw.ImageDraw, percent: int, anchor_x0: int, anchor_y0: int,
                   anchor_w: int, anchor_h: int) -> None:
-    """Battery glyph (now actually filled to `percent`, not just a static
-    outline -- easy now that this renders server-side instead of being a
-    fixed bitmap firmware drew) + "NN%" text, right-aligned under the
-    given anchor box (the manage QR box) -- a sensible default position,
-    not a constraint anything else has to route around; move this call
-    site's arguments to place it anywhere else instead."""
-    font = _font(BODY_FONT_SIZE)
+    """Battery glyph + "NN%" text, right-aligned under the given anchor
+    box (the manage QR box) -- a sensible default position, not a
+    constraint anything else has to route around; move this call site's
+    arguments to place it anywhere else instead. The glyph itself is
+    panel_style.draw_battery_icon -- the one shared implementation
+    replacing what used to be a second, independent copy of widgets/
+    battery.py's own icon-drawing code (same shape, same red/yellow/
+    green thresholds, previously kept in sync by convention only)."""
+    font = panel_style.font_regular(BODY_FONT_SIZE)
     text = f"{percent}%"
     icon_total_w = BATTERY_ICON_W + BATTERY_NUB_W
     text_w = draw.textlength(text, font=font)
@@ -162,22 +148,14 @@ def _draw_battery(img: Image.Image, draw: ImageDraw.ImageDraw, percent: int, anc
     x0 = anchor_x0 + anchor_w - w
     y0 = anchor_y0 + anchor_h + BATTERY_REGION_GAP
 
-    draw.rectangle([x0, y0, x0 + w, y0 + h], fill=(255, 255, 255), outline=(0, 0, 0))
+    draw.rounded_rectangle([x0, y0, x0 + w, y0 + h], radius=panel_style.CHIP_RADIUS,
+                           fill=(255, 255, 255), outline=(0, 0, 0))
 
     icon_x = x0 + PADDING
     icon_y = y0 + PADDING + (content_h - BATTERY_ICON_H) // 2
-    inner_x0, inner_y0 = icon_x + BATTERY_ICON_STROKE, icon_y + BATTERY_ICON_STROKE
-    inner_x1, inner_y1 = icon_x + BATTERY_ICON_W - BATTERY_ICON_STROKE, icon_y + BATTERY_ICON_H - BATTERY_ICON_STROKE
-    fill_x1 = inner_x0 + round((inner_x1 - inner_x0) * (percent / 100))
-    if fill_x1 > inner_x0:
-        draw.rectangle([inner_x0, inner_y0, fill_x1, inner_y1], fill=_battery_fill_color(percent))
-    draw.rectangle([icon_x, icon_y, icon_x + BATTERY_ICON_W, icon_y + BATTERY_ICON_H], outline=(0, 0, 0),
-                   width=BATTERY_ICON_STROKE)
-    nub_y = icon_y + (BATTERY_ICON_H - BATTERY_NUB_H) // 2
-    draw.rectangle([icon_x + BATTERY_ICON_W, nub_y, icon_x + BATTERY_ICON_W + BATTERY_NUB_W, nub_y + BATTERY_NUB_H],
-                   fill=(0, 0, 0))
+    panel_style.draw_battery_icon(draw, icon_x, icon_y, BATTERY_ICON_W, BATTERY_ICON_H, percent)
     draw_text(img, (icon_x + icon_total_w + BATTERY_ICON_TEXT_GAP, y0 + PADDING + (content_h - font.size) // 2),
-             text, font)
+             text, font, panel_style.battery_fill_color(percent))
 
 
 def _draw_face_label(img: Image.Image, draw: ImageDraw.ImageDraw, name: str, anchor_x: int, anchor_y: int) -> None:
@@ -185,7 +163,7 @@ def _draw_face_label(img: Image.Image, draw: ImageDraw.ImageDraw, name: str, anc
     anchor_y) point, flipped above if there's no room below, clamped to
     stay fully on-panel -- unlike the four corner boxes (always in-bounds
     by construction), a face can be anywhere, including near an edge."""
-    font = _font(BODY_FONT_SIZE)
+    font = panel_style.font_regular(BODY_FONT_SIZE)
     text_w = draw.textlength(name, font=font)
     bbox = draw.textbbox((0, 0), name, font=font)
     text_h = bbox[3] - bbox[1]
@@ -201,7 +179,8 @@ def _draw_face_label(img: Image.Image, draw: ImageDraw.ImageDraw, name: str, anc
     x0 = max(0, min(x0, img_w - w))
     y0 = max(0, min(y0, img_h - h))
 
-    draw.rectangle([x0, y0, x0 + w, y0 + h], fill=(255, 255, 255), outline=(0, 0, 0))
+    draw.rounded_rectangle([x0, y0, x0 + w, y0 + h], radius=panel_style.CHIP_RADIUS,
+                           fill=(255, 255, 255), outline=(0, 0, 0))
     draw_text(img, (x0 + FACE_LABEL_PADDING, y0 + FACE_LABEL_PADDING - bbox[1]), name, font)
 
 

server/app/migration.py

@@ -774,6 +774,121 @@ def _migration_29(conn) -> None:
         conn.execute(text("ALTER TABLE frames ADD COLUMN last_cycled_layout_id INTEGER"))
 
 
+def _migration_30(conn) -> None:
+    """"Now displaying" (models.Frame.last_displayed_image/
+    last_displayed_at) -- the web UI's header preview pair needs a frozen
+    record of exactly what the last device-facing render actually sent,
+    separate from the always-live "up next" re-render (see
+    routers/device.py's _record_last_displayed, api_frames.py's
+    /now-displaying endpoint). NULL/0.0 for every existing frame until
+    its next real device fetch -- no behavior change to what's served,
+    only a new thing recorded alongside it.
+
+    Guarded per-column, same reasoning as migration 26/27/29's own
+    comments: frames is a table test_migrations.py's pre-widget-system
+    replay tests leave un-dropped, so it keeps the fresh-install
+    create_all() copy -- which already has these columns -- when those
+    tests replay migrations 17+ from schema_version 16. Without the
+    guard, replaying this migration there re-adds a column that's already
+    there and SQLite raises "duplicate column name"."""
+    existing = {c["name"] for c in inspect(conn).get_columns("frames")}
+    if "last_displayed_image" not in existing:
+        conn.execute(text("ALTER TABLE frames ADD COLUMN last_displayed_image BLOB"))
+    if "last_displayed_at" not in existing:
+        conn.execute(text("ALTER TABLE frames ADD COLUMN last_displayed_at REAL NOT NULL DEFAULT 0.0"))
+
+
+def _migration_31(conn) -> None:
+    """Weather widget render style (models.WeatherWidgetConfig.
+    render_style): "classic" (existing hand-drawn PIL renderer,
+    unchanged) or "modern" (app/html_render.py's headless-Chromium/CSS
+    renderer). Every existing weather widget defaults to "classic" --
+    no behavior change until a widget's dialog switches it.
+
+    Guarded per-column, same reasoning as migration 30's own comment:
+    weather_widget_configs is a table some replay tests may re-create
+    fresh via create_all() (which already has this column) rather than
+    replaying migration 24's raw CREATE TABLE."""
+    existing = {c["name"] for c in inspect(conn).get_columns("weather_widget_configs")}
+    if "render_style" not in existing:
+        conn.execute(text("ALTER TABLE weather_widget_configs ADD COLUMN render_style TEXT NOT NULL DEFAULT 'classic'"))
+
+
+def _migration_32(conn) -> None:
+    """Photos widget's own independent palette/dithering (models.Frame.
+    photo_palette_rgb/photo_dither_strength -- see widgets/photos.py's
+    render()). NULL/1.0 defaults reproduce the exact previous rendering
+    (same reference palette/strength as the main fields) until a frame's
+    Configuration tab sets them differently.
+
+    Guarded per-column, same reasoning as migration 30/31's own comments."""
+    existing = {c["name"] for c in inspect(conn).get_columns("frames")}
+    if "photo_palette_rgb" not in existing:
+        conn.execute(text("ALTER TABLE frames ADD COLUMN photo_palette_rgb TEXT"))
+    if "photo_dither_strength" not in existing:
+        conn.execute(text("ALTER TABLE frames ADD COLUMN photo_dither_strength REAL NOT NULL DEFAULT 1.0"))
+
+
+def _migration_33(conn) -> None:
+    """Battery widget render style (models.BatteryWidgetConfig.
+    render_style) -- same shape as migration 31's weather one. Every
+    existing battery widget defaults to "classic", no behavior change."""
+    existing = {c["name"] for c in inspect(conn).get_columns("battery_widget_configs")}
+    if "render_style" not in existing:
+        conn.execute(text("ALTER TABLE battery_widget_configs ADD COLUMN render_style TEXT NOT NULL DEFAULT 'classic'"))
+
+
+def _migration_34(conn) -> None:
+    """Text widget render style (models.TextWidgetConfig.render_style) --
+    same shape as migration 31/33. Every existing text widget defaults to
+    "classic", no behavior change."""
+    existing = {c["name"] for c in inspect(conn).get_columns("text_widget_configs")}
+    if "render_style" not in existing:
+        conn.execute(text("ALTER TABLE text_widget_configs ADD COLUMN render_style TEXT NOT NULL DEFAULT 'classic'"))
+
+
+def _migration_35(conn) -> None:
+    """Tasks widget render style (models.TaskWidgetConfig.render_style)
+    -- same shape as migration 31/33/34. Every existing tasks widget
+    defaults to "classic", no behavior change."""
+    existing = {c["name"] for c in inspect(conn).get_columns("task_widget_configs")}
+    if "render_style" not in existing:
+        conn.execute(text("ALTER TABLE task_widget_configs ADD COLUMN render_style TEXT NOT NULL DEFAULT 'classic'"))
+
+
+def _migration_36(conn) -> None:
+    """Static image widget render style (models.StaticWidgetConfig.
+    render_style) -- same shape as migration 31/33/34/35."""
+    existing = {c["name"] for c in inspect(conn).get_columns("static_widget_configs")}
+    if "render_style" not in existing:
+        conn.execute(text("ALTER TABLE static_widget_configs ADD COLUMN render_style TEXT NOT NULL DEFAULT 'classic'"))
+
+
+def _migration_37(conn) -> None:
+    """Whiteboard widget render style (models.WhiteboardWidgetConfig.
+    render_style) -- same shape as migration 36."""
+    existing = {c["name"] for c in inspect(conn).get_columns("whiteboard_widget_configs")}
+    if "render_style" not in existing:
+        conn.execute(text("ALTER TABLE whiteboard_widget_configs ADD COLUMN render_style TEXT NOT NULL DEFAULT 'classic'"))
+
+
+def _migration_38(conn) -> None:
+    """Calendar widget render style (models.CalendarWidgetConfig.
+    render_style) -- same shape as migration 31/33/34/35/36/37."""
+    existing = {c["name"] for c in inspect(conn).get_columns("calendar_widget_configs")}
+    if "render_style" not in existing:
+        conn.execute(text("ALTER TABLE calendar_widget_configs ADD COLUMN render_style TEXT NOT NULL DEFAULT 'classic'"))
+
+
+def _migration_39(conn) -> None:
+    """Frame-level curated theme for "modern" style widgets (models.
+    Frame.theme, see theme_tokens.THEMES) -- same guarded-per-column
+    shape as every prior migration."""
+    existing = {c["name"] for c in inspect(conn).get_columns("frames")}
+    if "theme" not in existing:
+        conn.execute(text("ALTER TABLE frames ADD COLUMN theme TEXT NOT NULL DEFAULT 'classic'"))
+
+
 MIGRATIONS = [
     (1, _migration_1),
     (2, _migration_2),
@@ -804,6 +919,16 @@ MIGRATIONS = [
     (27, _migration_27),
     (28, _migration_28),
     (29, _migration_29),
+    (30, _migration_30),
+    (31, _migration_31),
+    (32, _migration_32),
+    (33, _migration_33),
+    (34, _migration_34),
+    (35, _migration_35),
+    (36, _migration_36),
+    (37, _migration_37),
+    (38, _migration_38),
+    (39, _migration_39),
 ]
 
 

server/app/models.py

@@ -178,6 +178,19 @@ class Frame(Base):
     # 0.0-1.0, see image_pipeline._quantize -- 1.0 matches this project's
     # original always-on full-strength Floyd-Steinberg dithering.
     dither_strength: Mapped[float] = mapped_column(Float, default=1.0)
+    # Same shape as palette_rgb/dither_strength above, but scoped to only
+    # the photos widget (widgets/photos.py quantizes against these itself,
+    # before returning -- see its own docstring) -- lets a frame tune the
+    # rest of its widgets' palette/dithering (e.g. a "modern" HTML-
+    # rendered dashboard look) independently of what actually looks best
+    # for real photographs. NULL/1.0 = same defaults as the main fields.
+    photo_palette_rgb: Mapped[list | None] = mapped_column(JSON, nullable=True, default=None)
+    photo_dither_strength: Mapped[float] = mapped_column(Float, default=1.0)
+    # Curated visual theme for "modern" (HTML/CSS) style widgets -- see
+    # theme_tokens.THEMES. Frame-level (like palette_rgb/dither_strength
+    # above), not per-widget, since a theme is "how this frame looks."
+    # Widgets rendered in classic (PIL) style ignore this entirely.
+    theme: Mapped[str] = mapped_column(String, default="classic")
 
     # -- calendar mode (see calendar_feed.py, calendar_render.py,
     # routers/device.py's RENDERERS["calendar"]) --
@@ -328,6 +341,16 @@ class Frame(Base):
     # starts over from the first one, same as an unset value.
     last_cycled_layout_id: Mapped[int | None] = mapped_column(Integer, nullable=True)
 
+    # -- "now displaying" (see routers/device.py's _record_last_displayed,
+    # api_frames.py's /now-displaying endpoint) -- exactly what the last
+    # device-facing render (/frame/image, /frame/advance, /frame/back, or
+    # a global hold action) actually sent, as an upright PNG, so the web
+    # UI's header preview can show it frozen alongside a live "up next"
+    # re-render instead of conflating the two. NULL until a real device
+    # has fetched at least once.
+    last_displayed_image: Mapped[bytes | None] = mapped_column(LargeBinary, nullable=True, default=None)
+    last_displayed_at: Mapped[float] = mapped_column(Float, default=0.0)
+
     # -- stats (flattened from the old nested FrameStats) --
     stats_first_seen: Mapped[float] = mapped_column(Float, default=0.0)
     stats_device_wakes: Mapped[int] = mapped_column(Integer, default=0)
@@ -532,6 +555,10 @@ class CalendarWidgetConfig(Base):
     week_days: Mapped[int] = mapped_column(Integer, default=7)
     week_layout: Mapped[str] = mapped_column(String, default="horizontal")
     week_start_offset: Mapped[int] = mapped_column(Integer, default=0)
+    # classic (calendar_render.py) vs modern (app/calendar_html_render.py,
+    # agenda mode only so far -- see that module's docstring) -- see
+    # widgets/calendar.py's render().
+    render_style: Mapped[str] = mapped_column(String, default="classic")
 
 
 class TaskWidgetConfig(Base):
@@ -570,6 +597,9 @@ class TaskWidgetConfig(Base):
     # outstanding ones -- off by default, same "opt into more" posture
     # as calendar_weather_enabled.
     show_completed: Mapped[bool] = mapped_column(Boolean, default=False)
+    # classic (hand-drawn PIL, calendar_render._build_tasks) vs modern
+    # (app/html_render.py) -- see widgets/tasks.py's render().
+    render_style: Mapped[str] = mapped_column(String, default="classic")
 
 
 class WhiteboardWidgetConfig(Base):
@@ -583,6 +613,10 @@ class WhiteboardWidgetConfig(Base):
     url: Mapped[str] = mapped_column(String, default="")
     checked_at: Mapped[float] = mapped_column(Float, default=0.0)
     cached_image: Mapped[bytes | None] = mapped_column(LargeBinary, nullable=True)
+    # classic (no chrome, unchanged) vs modern (app/html_render.py's
+    # rounded-corner shadowed card) -- see widgets/whiteboard.py's
+    # render().
+    render_style: Mapped[str] = mapped_column(String, default="classic")
 
 
 class WeatherWidgetConfig(Base):
@@ -597,13 +631,19 @@ class WeatherWidgetConfig(Base):
     `cached`'s shape depends on `mode`: {"temp","category"} for current,
     a list of {"time","temp","category"} for hourly, a
     {"YYYY-MM-DD": {...}} dict for daily, or a list of
-    {"label","high","low","category"} for multi_city."""
+    {"label","high","low","category"} for multi_city.
+    `render_style` picks which renderer draws the widget: "classic" (the
+    hand-drawn PIL primitives in app/weather_render.py, unchanged
+    default) or "modern" (app/html_render.py's Jinja2/headless-Chromium
+    path, "current"/"daily" modes only for now -- see weather.py's
+    render())."""
 
     __tablename__ = "weather_widget_configs"
 
     widget_id: Mapped[int] = mapped_column(ForeignKey("widgets.id", ondelete="CASCADE"), primary_key=True)
     mode: Mapped[str] = mapped_column(String, default="current")  # current | hourly | daily | multi_city
     provider: Mapped[str] = mapped_column(String, default="open_meteo")  # open_meteo | nws
+    render_style: Mapped[str] = mapped_column(String, default="classic")  # classic | modern
     units: Mapped[str] = mapped_column(String, default="fahrenheit")  # fahrenheit | celsius
     # Single-location modes only (current/hourly/daily) -- geocoded once
     # via weather.geocode_city() when set, same idiom as
@@ -652,6 +692,9 @@ class TextWidgetConfig(Base):
     font_family: Mapped[str] = mapped_column(String, default="sans")
     align: Mapped[str] = mapped_column(String, default="left")  # "left" | "center" | "right"
     background_color: Mapped[str] = mapped_column(String, default="#ffffff")
+    # classic (hand-drawn PIL) vs modern (app/html_render.py) -- see
+    # widgets/text.py's render()/render_preview_png().
+    render_style: Mapped[str] = mapped_column(String, default="classic")
 
 
 class StaticWidgetConfig(Base):
@@ -673,6 +716,10 @@ class StaticWidgetConfig(Base):
     # minus crop_faces -- no face detection for an uploaded image (see
     # image_pipeline.STATIC_DISPLAY_MODES).
     display_mode: Mapped[str] = mapped_column(String, default="crop_fill")
+    # classic (no chrome, unchanged) vs modern (app/html_render.py's
+    # rounded-corner shadowed card) -- see widgets/static_image.py's
+    # render().
+    render_style: Mapped[str] = mapped_column(String, default="classic")
 
 
 class BatteryWidgetConfig(Base):
@@ -683,12 +730,14 @@ class BatteryWidgetConfig(Base):
     of anything the widget itself fetches or the user authors. `mode`
     "compact" is icon + percent only; "detailed" (default) adds the
     routers.common.battery_estimate_s time-remaining estimate and the
-    last report's age."""
+    last report's age. `render_style` picks classic (hand-drawn PIL) vs
+    modern (app/html_render.py) -- see widgets/battery.py's render()."""
 
     __tablename__ = "battery_widget_configs"
 
     widget_id: Mapped[int] = mapped_column(ForeignKey("widgets.id", ondelete="CASCADE"), primary_key=True)
     mode: Mapped[str] = mapped_column(String, default="detailed")  # compact | detailed
+    render_style: Mapped[str] = mapped_column(String, default="classic")  # classic | modern
 
 
 # widget_type -> its per-type extension table, keyed by widget_id. Used

server/app/panel_style.py

@@ -0,0 +1,184 @@
+"""Shared visual language for everything drawn onto the e-ink panel
+(excluding widgets/text.py, which already has its own richer multi-
+family font picker and is left alone) -- spacing, ink-color resolution,
+Inter font loading, and the small set of drawing primitives
+(header bar, color chip, battery icon) more than one render module needs.
+
+Centralizes what used to be independently redefined per render file
+(calendar_render.py/weather_render.py each had their own MARGIN/BG/FG/
+RULE, widgets/battery.py and manage_overlay.py each had their own
+battery-glyph-drawing code) so the panel reads as one consistent system
+instead of N separately-styled widgets. Still bound by the same hard
+constraints as everything else that draws before the single whole-canvas
+quantize/dither pass (see image_pipeline.py's module docstring/draw_text):
+every fill here is one of DEFAULT_PALETTE_RGB's 6 exact colors, and text
+always routes through image_pipeline.draw_text.
+"""
+
+from __future__ import annotations
+
+from functools import lru_cache
+from pathlib import Path
+
+from PIL import Image, ImageDraw, ImageFont
+
+from .image_pipeline import DEFAULT_PALETTE_RGB
+
+# Spacing scale. CONTENT_MARGIN carries over calendar_render.py/
+# weather_render.py's own long-tuned MARGIN=20 value unchanged (not
+# re-tuned -- every wrap/truncation-width calc in those modules was
+# measured against it). GUTTER is new: the inset every widget applies
+# within its own target_w x target_h box (see card_canvas) to get a
+# visible seam between adjacent widgets without touching grid.py's
+# zero-gap cell math.
+GUTTER = 6
+CONTENT_MARGIN = 20
+CARD_RADIUS = 12
+CHIP_RADIUS = 4
+
+# Index constants into DEFAULT_PALETTE_RGB/a frame's own Frame.
+# palette_rgb override -- same order as image_pipeline.PALETTE_LABELS.
+BLACK, WHITE, YELLOW, RED, BLUE, GREEN = range(6)
+
+# Which accent ink each widget kind's chrome (header bar, task checkbox,
+# etc.) uses -- one dict, so "what color is a calendar header" has a
+# single answer instead of being hardcoded separately everywhere a
+# render module wants it. This is what makes a future global color
+# theme *possible* without another pass through every render module: a
+# per-frame override just needs to pick a different THEME mapping (or
+# remap individual entries) here and resolve through theme_color/ink
+# below, which already goes through a frame's own tuned Frame.
+# palette_rgb -- swapping a slot's actual RGB (e.g. a custom "blue")
+# already re-themes every widget that uses THEME_CALENDAR for its
+# header, with no other code to touch. Weather deliberately maps to
+# BLACK, not a color -- see weather_render's header call site -- so its
+# own hand-drawn, already-colorful icons stay the star.
+THEME_CALENDAR = BLUE
+THEME_TASKS = GREEN
+THEME_WEATHER = BLACK
+THEME = {"calendar": THEME_CALENDAR, "tasks": THEME_TASKS, "weather": THEME_WEATHER}
+
+
+def theme_color(widget_kind: str, palette_rgb: list | None = None) -> tuple[int, int, int]:
+    """THEME[widget_kind] resolved against this frame's actual palette --
+    the one call every render module's header/accent chrome should go
+    through instead of hardcoding a palette index inline."""
+    return ink(palette_rgb, THEME[widget_kind])
+
+
+def ink(palette_rgb: list | None, index: int) -> tuple[int, int, int]:
+    """One of this frame's actual panel colors by DEFAULT_PALETTE_RGB
+    index -- generalizes the same resolution idiom weather_render._ink/
+    calendar_render._event_colors already used locally, so a custom
+    palette override (Frame.palette_rgb) still gets its own actual
+    yellow/red/blue/green, and every fill stays an exact, ditherless
+    palette match either way."""
+    return tuple((palette_rgb or DEFAULT_PALETTE_RGB)[index])
+
+
+_FONT_DIR = Path(__file__).resolve().parent / "fonts"
+
+
+@lru_cache(maxsize=256)
+def font_bold(size: int) -> ImageFont.FreeTypeFont:
+    return ImageFont.truetype(str(_FONT_DIR / "Inter-Bold.ttf"), size)
+
+
+@lru_cache(maxsize=256)
+def font_regular(size: int) -> ImageFont.FreeTypeFont:
+    return ImageFont.truetype(str(_FONT_DIR / "Inter-Regular.ttf"), size)
+
+
+def card_canvas(target_w: int, target_h: int,
+               bg: tuple[int, int, int] = (255, 255, 255)) -> tuple:
+    """A full target_w x target_h canvas filled with `bg`, plus the
+    GUTTER-inset rect (x0, y0, w, h) every widget should draw its actual
+    chrome/content within -- this is the whole mechanism behind the
+    gutter between widgets (see module docstring): the widget's render()
+    contract (exact target_w x target_h in, same size out, unchanged) is
+    what routers/device.py pastes and what draw_widget_border frames, so
+    a border still frames the widget's true full box; only the widget's
+    own drawing backs off from that box's true edge."""
+    img = Image.new("RGB", (target_w, target_h), bg)
+    draw = ImageDraw.Draw(img)
+    x0, y0 = GUTTER, GUTTER
+    w, h = max(1, target_w - 2 * GUTTER), max(1, target_h - 2 * GUTTER)
+    return img, draw, (x0, y0, w, h)
+
+
+def _clamped_radius(radius: int, w: int, h: int) -> int:
+    return max(0, min(radius, w // 2, h // 2))
+
+
+def draw_header_bar(draw: ImageDraw.ImageDraw, rect: tuple[int, int, int, int], height: int,
+                    fill: tuple[int, int, int], radius: int = CARD_RADIUS) -> None:
+    """A widget's title bar: rounded top corners only (corners=(tl, tr,
+    bl, br), the bottom pair left square) so it reads as a card's header
+    fused to the content below it, not a standalone pill floating with a
+    gap above its own body."""
+    x0, y0, w, h = rect
+    r = _clamped_radius(radius, w, height * 2)
+    draw.rounded_rectangle([x0, y0, x0 + w, y0 + height], radius=r, fill=fill,
+                           corners=(True, True, False, False))
+
+
+def draw_color_chip(draw: ImageDraw.ImageDraw, x0: int, y0: int, x1: int, y1: int,
+                    colors: list[tuple[int, int, int]], radius: int = CHIP_RADIUS) -> None:
+    """One rounded chip for a single-source event/task, or that same
+    footprint split into equal-width side-by-side segments -- one per
+    contributing calendar -- for a deduplicated shared event (see
+    calendar_render._event_colors/calendar_feed.merge_events). Splitting
+    rather than e.g. concentric rings keeps every color equally "thick
+    and bold" at a glance, the same design goal a single pinned color
+    already has. Generalizes calendar_render.py's old private
+    _draw_color_bar so the radius comes from one shared constant."""
+    if len(colors) == 1:
+        r = _clamped_radius(radius, x1 - x0, y1 - y0)
+        draw.rounded_rectangle([x0, y0, x1, y1], radius=r, fill=colors[0])
+        return
+    seg_w = (x1 - x0) / len(colors)
+    for i, color in enumerate(colors):
+        seg_x0 = round(x0 + i * seg_w)
+        seg_x1 = round(x0 + (i + 1) * seg_w) - (2 if i < len(colors) - 1 else 0)
+        draw.rectangle([seg_x0, y0, seg_x1, y1], fill=color)
+
+
+def battery_fill_color(percent: int, palette_rgb: list | None = None) -> tuple[int, int, int]:
+    """Red/yellow/green by charge level -- the fill itself carries the
+    "how worried should I be" signal, not just the number next to it.
+    Shared threshold logic for widgets/battery.py and manage_overlay.py,
+    which previously each defined the same three-tier thresholds twice."""
+    if percent <= 15:
+        return ink(palette_rgb, RED)
+    if percent <= 40:
+        return ink(palette_rgb, YELLOW)
+    return ink(palette_rgb, GREEN)
+
+
+def draw_battery_icon(draw: ImageDraw.ImageDraw, x0: int, y0: int, icon_w: int, icon_h: int,
+                      percent: int, palette_rgb: list | None = None) -> None:
+    """A rounded battery glyph -- outline + charge-level fill + terminal
+    nub -- anchored at (x0, y0), the body's own top-left corner (the nub
+    extends past icon_w on the right). The one shared implementation
+    behind what used to be two separate ImageDraw glyphs: widgets/
+    battery.py's own icon+percent widget, and manage_overlay.py's compact
+    battery readout on the "scan to manage" overlay -- same shape, same
+    red/yellow/green thresholds, previously kept in sync by convention
+    rather than by sharing code."""
+    stroke = max(2, icon_h // 12)
+    nub_w = max(3, icon_w // 10)
+    nub_h = icon_h // 2
+    radius = _clamped_radius(icon_h // 6, icon_w, icon_h)
+
+    inner_x0, inner_y0 = x0 + stroke, y0 + stroke
+    inner_x1, inner_y1 = x0 + icon_w - stroke, y0 + icon_h - stroke
+    fill_x1 = inner_x0 + round((inner_x1 - inner_x0) * (max(0, min(100, percent)) / 100))
+    if fill_x1 > inner_x0:
+        fill_radius = _clamped_radius(radius, fill_x1 - inner_x0, inner_y1 - inner_y0)
+        draw.rounded_rectangle([inner_x0, inner_y0, fill_x1, inner_y1], radius=fill_radius,
+                               fill=battery_fill_color(percent, palette_rgb))
+    draw.rounded_rectangle([x0, y0, x0 + icon_w, y0 + icon_h], radius=radius, outline=(0, 0, 0), width=stroke)
+    nub_y = y0 + (icon_h - nub_h) // 2
+    nub_radius = _clamped_radius(max(1, nub_w // 3), nub_w, nub_h)
+    draw.rounded_rectangle([x0 + icon_w, nub_y, x0 + icon_w + nub_w, nub_y + nub_h], radius=nub_radius,
+                           fill=(0, 0, 0))

server/app/routers/api_frames.py

@@ -25,7 +25,7 @@ from fastapi.responses import Response
 from sqlalchemy import select
 from sqlalchemy.orm import Session
 
-from .. import gitea_releases, grid, quiet_hours
+from .. import gitea_releases, grid, quiet_hours, theme_tokens
 from ..auth import require_frame_control, require_frame_view, require_user_api
 from ..db import frame_locked, get_db
 from ..global_actions import GLOBAL_ACTIONS
@@ -105,6 +105,10 @@ def api_config_save(
     color_boost: float | None = Form(None),
     contrast_boost: float | None = Form(None),
     dither_strength: float | None = Form(None),
+    photo_palette: list[str] | None = Form(None),
+    photo_palette_reset: bool | None = Form(None),
+    photo_dither_strength: float | None = Form(None),
+    theme: str | None = Form(None),
     hold_duration_ms: int | None = Form(None),
     next_hold_action: str | None = Form(None),
     back_hold_action: str | None = Form(None),
@@ -182,6 +186,19 @@ def api_config_save(
             cfg.contrast_boost = max(0.0, min(2.0, contrast_boost))
         if dither_strength is not None:
             cfg.dither_strength = max(0.0, min(1.0, dither_strength))
+        if photo_palette_reset:
+            cfg.photo_palette_rgb = None
+        elif photo_palette is not None:
+            if len(photo_palette) != len(PALETTE_LABELS):
+                raise HTTPException(400, f"Expected {len(PALETTE_LABELS)} palette colors, got {len(photo_palette)}")
+            parsed = [hex_to_rgb(h) for h in photo_palette]
+            if any(rgb is None for rgb in parsed):
+                raise HTTPException(400, "Palette colors must be #rrggbb hex values")
+            cfg.photo_palette_rgb = [list(rgb) for rgb in parsed]
+        if photo_dither_strength is not None:
+            cfg.photo_dither_strength = max(0.0, min(1.0, photo_dither_strength))
+        if theme is not None:
+            cfg.theme = theme if theme in theme_tokens.THEMES else "classic"
         if hold_duration_ms is not None:
             cfg.hold_duration_ms = max(MIN_HOLD_DURATION_MS, min(MAX_HOLD_DURATION_MS, hold_duration_ms))
         if next_hold_action is not None:
@@ -244,6 +261,14 @@ def api_status(
         "device": {
             "last_seen": frame.last_seen or None,
             "overdue": bool(frame.last_seen and now - frame.last_seen > overdue_gap),
+            # When the device is next expected to check in, per the same
+            # sleep duration frame_config() actually hands it (see
+            # device.py's /frame/config) -- not the raw overdue_gap above,
+            # which is deliberately generous (OVERDUE_FACTOR) to avoid
+            # false alarms during quiet hours rather than a best guess.
+            "expected_next_checkin": (
+                frame.last_seen + quiet_hours.effective_refresh_interval_s(frame) if frame.last_seen else None
+            ),
             "firmware_version": frame.device_firmware_version or None,
             "firmware_available": frame.firmware_available_version or None,
             "battery": (
@@ -271,6 +296,25 @@ def api_frame_preview(
     return Response(content=png, media_type="image/png")
 
 
+@router.get("/api/frames/{frame_id}/now-displaying")
+def api_frame_now_displaying(frame: Frame = Depends(require_frame_view)):
+    """Exactly what was last actually sent to this frame's device (see
+    routers/device.py's _record_last_displayed) -- the frozen "now
+    displaying" half of the header preview pair, as opposed to /preview's
+    always-live "up next" re-render. 404 (not a placeholder image) until
+    the device has fetched at least once, so the web UI can show its own
+    empty state instead of a broken image. X-Displayed-At carries the
+    capture time (unix seconds) for a "N ago" label -- a header, not the
+    body, since the body is the raw PNG bytes."""
+    if frame.last_displayed_image is None:
+        raise HTTPException(404, "This frame hasn't displayed anything yet")
+    return Response(
+        content=frame.last_displayed_image,
+        media_type="image/png",
+        headers={"X-Displayed-At": str(frame.last_displayed_at)},
+    )
+
+
 @router.get("/api/frames/{frame_id}/battery-log")
 def api_battery_log(frame: Frame = Depends(require_frame_view), db: Session = Depends(get_db)):
     rows = db.execute(
@@ -384,6 +428,7 @@ def api_firmware_check(
         "board": frame.device_board_variant or None,
         "latest_version": frame.firmware_gitea_latest_version or None,
         "staged_version": frame.firmware_available_version or None,
+        "running_version": frame.device_firmware_version or None,
         "update_available": update_available,
     }
 

server/app/routers/api_layouts.py

@@ -56,13 +56,17 @@ LAYOUT_CONFIG_FIELDS: dict[str, tuple[str, ...]] = {
     "photos": ("album_id", "order", "display_mode", "queue_target_len"),
     "calendar": (
         "view", "week_start", "weather_enabled", "weather_units", "weather_cities",
-        "week_days", "week_layout", "week_start_offset",
+        "week_days", "week_layout", "week_start_offset", "render_style",
+    ),
+    "tasks": ("name", "show_completed", "render_style"),
+    "static": ("display_mode", "original_filename", "render_style"),
+    "text": ("content", "font_size", "font_family", "align", "background_color", "render_style"),
+    "whiteboard": ("user_id", "url", "render_style"),
+    "battery": ("mode", "render_style"),
+    "weather": (
+        "mode", "provider", "units", "city_label", "city_latitude", "city_longitude",
+        "hourly_interval_hours", "daily_days", "cities", "render_style",
     ),
-    "tasks": ("name", "show_completed"),
-    "static": ("display_mode", "original_filename"),
-    "text": ("content", "font_size", "font_family", "align", "background_color"),
-    "whiteboard": ("user_id", "url"),
-    "battery": ("mode",),
 }
 
 # widget_type -> (FrameCalendar|FrameTaskList model, SavedLayoutSource.kind)

server/app/routers/api_widgets.py

@@ -35,11 +35,16 @@ from ..image_pipeline import (
     DEFAULT_STATIC_DISPLAY_MODE,
     DISPLAY_MODES,
     hex_to_rgb,
+    logical_render_size,
     MAX_BORDER_THICKNESS,
     MIN_BORDER_THICKNESS,
     PALETTE_LABELS,
     STATIC_DISPLAY_MODES,
     render_preview_png,
+    compose_into,
+    _enhance,
+    _png_bytes,
+    _quantize,
 )
 from ..image_upload import decode_upload
 from ..models import (
@@ -317,9 +322,12 @@ def api_widget_config_save(
     album_id: str | None = Form(None),
     order: str | None = Form(None),
     display_mode: str | None = Form(None),
+    static_render_style: str | None = Form(None),
+    whiteboard_render_style: str | None = Form(None),
     queue_target_len: int | None = Form(None),
     # calendar
     calendar_view: str | None = Form(None),
+    calendar_render_style: str | None = Form(None),
     calendar_week_start: int | None = Form(None),
     calendar_week_days: int | None = Form(None),
     calendar_week_layout: str | None = Form(None),
@@ -329,10 +337,12 @@ def api_widget_config_save(
     # tasks
     tasks_name: str | None = Form(None),
     tasks_show_completed: bool | None = Form(None),
+    tasks_render_style: str | None = Form(None),
     # text
     text_html: str | None = Form(None),
     text_font_size: int | None = Form(None),
     text_font_family: str | None = Form(None),
+    text_render_style: str | None = Form(None),
     text_align: str | None = Form(None),
     text_background_color: str | None = Form(None),
     # weather
@@ -341,8 +351,10 @@ def api_widget_config_save(
     weather_units: str | None = Form(None),
     weather_hourly_interval_hours: int | None = Form(None),
     weather_daily_days: int | None = Form(None),
+    weather_render_style: str | None = Form(None),
     # battery
     battery_mode: str | None = Form(None),
+    battery_render_style: str | None = Form(None),
 ):
     """Every field optional -- same partial-update, form-urlencoded
     convention as the old frame-level api_config_save, now scoped to one
@@ -405,6 +417,8 @@ def api_widget_config_save(
                     # new unit label.
                     ccfg.weather_checked_at = 0.0
                 ccfg.weather_units = calendar_weather_units
+            if calendar_render_style is not None and calendar_render_style in ("classic", "modern"):
+                ccfg.render_style = calendar_render_style
     elif widget.widget_type == "tasks":
         with widget_locked(db, frame.id, widget.id) as (_, _, tcfg):
             if tasks_name is not None:
@@ -415,10 +429,22 @@ def api_widget_config_save(
             if tasks_show_completed is not None and tasks_show_completed != tcfg.show_completed:
                 tcfg.show_completed = tasks_show_completed
                 tcfg.checked_at = 0.0  # pick up the change promptly
+            if tasks_render_style is not None and tasks_render_style in ("classic", "modern"):
+                tcfg.render_style = tasks_render_style
     elif widget.widget_type == "static":
         with widget_locked(db, frame.id, widget.id) as (_, _, scfg):
             if display_mode is not None:
                 scfg.display_mode = display_mode if display_mode in STATIC_DISPLAY_MODES else DEFAULT_STATIC_DISPLAY_MODE
+            if static_render_style is not None and static_render_style in ("classic", "modern"):
+                scfg.render_style = static_render_style
+    elif widget.widget_type == "whiteboard":
+        # user_id/url go through the dedicated /whiteboard-source endpoint
+        # (owner-only, JSON body) -- render_style is the one setting this
+        # widget type takes through the shared /config form, same as
+        # every other widget type's own render_style.
+        with widget_locked(db, frame.id, widget.id) as (_, _, wbcfg):
+            if whiteboard_render_style is not None and whiteboard_render_style in ("classic", "modern"):
+                wbcfg.render_style = whiteboard_render_style
     elif widget.widget_type == "text":
         with widget_locked(db, frame.id, widget.id) as (_, _, xcfg):
             if text_html is not None:
@@ -439,6 +465,8 @@ def api_widget_config_save(
                 xcfg.background_color = (
                     text_background_color if hex_to_rgb(text_background_color) else "#ffffff"
                 )
+            if text_render_style is not None and text_render_style in ("classic", "modern"):
+                xcfg.render_style = text_render_style
     elif widget.widget_type == "weather":
         with widget_locked(db, frame.id, widget.id) as (_, _, wcfg):
             if weather_mode is not None and weather_mode in ("current", "hourly", "daily", "multi_city"):
@@ -469,10 +497,14 @@ def api_widget_config_save(
                 wcfg.hourly_interval_hours = max(1, min(24, weather_hourly_interval_hours))
             if weather_daily_days is not None:
                 wcfg.daily_days = max(1, min(14, weather_daily_days))
+            if weather_render_style is not None and weather_render_style in ("classic", "modern"):
+                wcfg.render_style = weather_render_style
     elif widget.widget_type == "battery":
         with widget_locked(db, frame.id, widget.id) as (_, _, bcfg):
             if battery_mode is not None:
                 bcfg.mode = battery_mode if battery_mode in ("compact", "detailed") else "detailed"
+            if battery_render_style is not None and battery_render_style in ("classic", "modern"):
+                bcfg.render_style = battery_render_style
     with frame_locked(db, frame.id) as cfg:
         cfg.stats_config_saves += 1
     return {"status": "saved"}
@@ -833,14 +865,30 @@ def api_widget_preview_calendar(
     ccfg = db.get(CalendarWidgetConfig, widget.id)
     events, summary = get_or_refresh_calendar_events_for_widget(db, frame, widget)
     weather_cities = get_or_refresh_weather_for_widget(db, frame, widget) if ccfg.weather_enabled else None
-    png = calendar_render.render_calendar_preview_png(
-        events, view=ccfg.view, browse_offset=ccfg.browse_offset, orientation=frame.orientation,
-        palette_rgb=frame.palette_rgb, timezone=frame.timezone, fetch_summary=summary,
-        week_start=ccfg.week_start,
-        weather_cities=weather_cities, weather_units=ccfg.weather_units,
-        week_days=ccfg.week_days, week_layout=ccfg.week_layout,
-        week_start_offset=ccfg.week_start_offset,
-    )
+
+    target_w, target_h = logical_render_size(frame.orientation)
+    if ccfg.render_style == "modern":
+        from zoneinfo import ZoneInfo
+
+        from .. import calendar_html_render
+
+        tz = ZoneInfo(frame.timezone) if frame.timezone else ZoneInfo("UTC")
+        img = calendar_html_render.build(
+            events, ccfg.view, ccfg.browse_offset, target_w, target_h, tz, ccfg.week_start, frame.palette_rgb,
+            weather_cities, ccfg.weather_units, ccfg.week_days, ccfg.week_layout, ccfg.week_start_offset,
+            frame.theme,
+        )
+        quantized = _quantize(img, frame.palette_rgb, dither_strength=1.0)
+        png = _png_bytes(quantized)
+    else:
+        png = calendar_render.render_calendar_preview_png(
+            events, view=ccfg.view, browse_offset=ccfg.browse_offset, orientation=frame.orientation,
+            palette_rgb=frame.palette_rgb, timezone=frame.timezone, fetch_summary=summary,
+            week_start=ccfg.week_start,
+            weather_cities=weather_cities, weather_units=ccfg.weather_units,
+            week_days=ccfg.week_days, week_layout=ccfg.week_layout,
+            week_start_offset=ccfg.week_start_offset,
+        )
     return Response(content=png, media_type="image/png")
 
 
@@ -859,8 +907,17 @@ def api_widget_preview_tasks(
         raise HTTPException(400, "No task lists included on this widget yet")
     tcfg = db.get(TaskWidgetConfig, widget.id)
     tasks = get_or_refresh_tasks_for_widget(db, frame, widget)
-    png = calendar_render.render_tasks_preview_png(tasks, orientation=frame.orientation,
-                                                    palette_rgb=frame.palette_rgb, title=tcfg.name or "Tasks")
+    title = tcfg.name or "Tasks"
+    if tcfg.render_style == "modern":
+        from .. import html_render
+
+        target_w, target_h = logical_render_size(frame.orientation)
+        img = html_render.build_tasks(tasks, target_w, target_h, frame.palette_rgb, title, frame.theme)
+        quantized = _quantize(img, frame.palette_rgb, dither_strength=1.0)
+        png = _png_bytes(quantized)
+    else:
+        png = calendar_render.render_tasks_preview_png(tasks, orientation=frame.orientation,
+                                                        palette_rgb=frame.palette_rgb, title=title)
     return Response(content=png, media_type="image/png")
 
 
@@ -1108,10 +1165,19 @@ def api_widget_preview_weather(
         if wcfg.mode == "multi_city":
             raise HTTPException(400, "No cities added to this widget yet")
         raise HTTPException(400, "No location set on this widget yet")
-    png = weather_render.render_weather_preview_png(
-        wcfg.mode, data, orientation=frame.orientation, palette_rgb=frame.palette_rgb, units=wcfg.units,
-        city_label=wcfg.city_label or "", interval_hours=wcfg.hourly_interval_hours,
-    )
+    if wcfg.render_style == "modern" and wcfg.mode in ("current", "daily"):
+        # Same local-import reasoning as widgets/weather.py's render().
+        from .. import html_render
+
+        png = html_render.render_weather_preview_png(
+            wcfg.mode, data, orientation=frame.orientation, palette_rgb=frame.palette_rgb, units=wcfg.units,
+            city_label=wcfg.city_label or "", theme_name=frame.theme,
+        )
+    else:
+        png = weather_render.render_weather_preview_png(
+            wcfg.mode, data, orientation=frame.orientation, palette_rgb=frame.palette_rgb, units=wcfg.units,
+            city_label=wcfg.city_label or "", interval_hours=wcfg.hourly_interval_hours,
+        )
     return Response(content=png, media_type="image/png")
 
 
@@ -1158,11 +1224,22 @@ def api_widget_preview_static(
     if not scfg.image:
         raise HTTPException(400, "No image uploaded to this widget yet")
     source = Image.open(io.BytesIO(scfg.image)).convert("RGB")
-    png = render_preview_png(
-        source, faces=None, orientation=frame.orientation, palette_rgb=frame.palette_rgb,
-        display_mode=scfg.display_mode, color_boost=frame.color_boost,
-        contrast_boost=frame.contrast_boost, dither_strength=frame.dither_strength,
-    )
+    if scfg.render_style == "modern":
+        from .. import html_render
+
+        target_w, target_h = logical_render_size(frame.orientation)
+        composed = compose_into(source, faces=None, target_w=target_w, target_h=target_h,
+                                display_mode=scfg.display_mode)
+        fitted = _enhance(composed, frame.color_boost, frame.contrast_boost)
+        img = html_render.build_framed_image(fitted, target_w, target_h, frame.palette_rgb, frame.theme, "static")
+        quantized = _quantize(img, frame.palette_rgb, dither_strength=1.0)
+        png = _png_bytes(quantized)
+    else:
+        png = render_preview_png(
+            source, faces=None, orientation=frame.orientation, palette_rgb=frame.palette_rgb,
+            display_mode=scfg.display_mode, color_boost=frame.color_boost,
+            contrast_boost=frame.contrast_boost, dither_strength=frame.dither_strength,
+        )
     return Response(content=png, media_type="image/png")
 
 
@@ -1181,7 +1258,8 @@ def api_widget_preview_text(
     xcfg = db.get(TextWidgetConfig, widget.id)
     if not has_text(xcfg.content):
         raise HTTPException(400, "No text authored on this widget yet")
-    png = text_widget.render_preview_png(xcfg, orientation=frame.orientation, palette_rgb=frame.palette_rgb)
+    png = text_widget.render_preview_png(xcfg, orientation=frame.orientation, palette_rgb=frame.palette_rgb,
+                                         theme_name=frame.theme)
     return Response(content=png, media_type="image/png")
 
 
@@ -1297,8 +1375,19 @@ def api_widget_preview_whiteboard(
             raise HTTPException(400, "No whiteboard configured on this widget yet")
         raise HTTPException(502, "Could not fetch/render the whiteboard yet -- check the URL and credentials")
     source = Image.open(io.BytesIO(png_bytes)).convert("RGB")
-    png = render_preview_png(
-        source, faces=None, orientation=frame.orientation, palette_rgb=frame.palette_rgb,
-        display_mode="letterbox",
-    )
+    if wcfg.render_style == "modern":
+        from .. import html_render
+
+        target_w, target_h = logical_render_size(frame.orientation)
+        composed = compose_into(source, faces=None, target_w=target_w, target_h=target_h,
+                                display_mode="letterbox")
+        img = html_render.build_framed_image(composed, target_w, target_h, frame.palette_rgb, frame.theme,
+                                             "whiteboard")
+        quantized = _quantize(img, frame.palette_rgb, dither_strength=1.0)
+        png = _png_bytes(quantized)
+    else:
+        png = render_preview_png(
+            source, faces=None, orientation=frame.orientation, palette_rgb=frame.palette_rgb,
+            display_mode="letterbox",
+        )
     return Response(content=png, media_type="image/png")

server/app/routers/common.py

@@ -59,6 +59,12 @@ MIN_ESTIMATE_SAMPLES = 5  # discharge steps needed before trusting the average
 # single noisy reading needs rejecting at the per-wake-drop level, not
 # just at the recharge-detection level.
 OUTLIER_MODIFIED_Z_THRESHOLD = 3.5
+# Readings considered on each side of a given reading when
+# _smooth_percents looks for local outliers. Needs to be at least half
+# the length of the longest bad-reading burst a noisy divider produces
+# (observed up to ~4 consecutive corrupted reports on one frame) so the
+# good neighbors still outnumber the bad ones in the window.
+BATTERY_SMOOTHING_WINDOW = 4
 
 # "Overdue" threshold multiplier: the device should check in roughly every
 # refresh_interval_s; give it half again as long before flagging it.
@@ -179,6 +185,50 @@ def _reject_outlier_drops(steps: list[tuple[int, float]]) -> list[tuple[int, flo
     return kept or steps  # never filter down to nothing
 
 
+def _smooth_percents(percents: list[int]) -> list[float]:
+    """Replaces any reading that's a wild outlier against its own local
+    neighborhood with that neighborhood's median, before per-wake drop
+    steps are ever built from the series.
+
+    _reject_outlier_drops (above) only catches a bad reading by how much
+    it distorts the *steps* immediately on either side of it -- which is
+    exactly what one isolated glitch does, but a 1M-ohm divider (see
+    firmware/main/battery.c) doesn't always misfire in isolation: several
+    consecutive reports can drift or glitch together (a multi-minute
+    crawl from 68 up into the high 70s with nothing charging, or a run of
+    several ~40 reports spliced into an otherwise flat ~53 run). A step
+    computed *between* two bad readings in the same burst looks like an
+    ordinary small change, not an outlier, so it sails through
+    _reject_outlier_drops untouched.
+
+    A Hampel identifier catches that instead: each reading is compared to
+    the median of its own local window (not the whole series), using the
+    same MAD-based modified z-score as _reject_outlier_drops so this
+    adapts to how noisy a given frame's sensor actually is rather than a
+    fixed percent-point cutoff. A window of BATTERY_SMOOTHING_WINDOW
+    reports on each side tolerates a bad burst up to that long while
+    still being outvoted by the surrounding good readings."""
+    n = len(percents)
+    smoothed = list(percents)
+    for i in range(n):
+        lo = max(0, i - BATTERY_SMOOTHING_WINDOW)
+        hi = min(n, i + BATTERY_SMOOTHING_WINDOW + 1)
+        neighborhood = percents[lo:hi]
+        median = statistics.median(neighborhood)
+        abs_devs = [abs(v - median) for v in neighborhood]
+        # Unlike _reject_outlier_drops, no mean-of-abs-devs fallback here:
+        # a burst can be a big enough share of this small a window that
+        # the mean itself gets dragged up by the very values being
+        # tested, hiding them. A flat 1-percentage-point floor -- this
+        # project's smallest real unit of noise -- keeps the test from
+        # dividing by zero without being skewed by the burst it's
+        # checking.
+        mad = statistics.median(abs_devs) or 1
+        if abs(0.6745 * (percents[i] - median) / mad) > OUTLIER_MODIFIED_Z_THRESHOLD:
+            smoothed[i] = median
+    return smoothed
+
+
 def battery_estimate_s(frame: Frame, db: Session) -> int | None:
     """Remaining-time estimate from a recency-weighted average of the
     *per-wake* percent drop, over the last BATTERY_ESTIMATE_SAMPLE_COUNT
@@ -189,18 +239,21 @@ def battery_estimate_s(frame: Frame, db: Session) -> int | None:
 
     Consecutive reports are assumed to be consecutive wakes (firmware
     reports battery on every wake while on battery), so each step's
-    (prev_percent - next_percent) is that wake's cost. A step where
-    percent went *up* is a recharge, not negative drain, and is skipped
-    entirely rather than folded in as a weird outlier; a flat step
-    (0% change) still counts as a real, cheap wake -- excluding those
-    would systematically overstate the per-wake cost by only counting
-    the wakes that happened to tick the percentage down. The remaining
-    steps then get one more pass, _reject_outlier_drops, to catch the
-    single-noisy-reading case that "percent went up" alone can't (see
-    that function's docstring). Steps are weighted linearly by recency
-    (step i of n gets weight i, 1-indexed) so a recent change in usage
-    pattern shows up quickly instead of being washed out by a long flat
-    history.
+    (prev_percent - next_percent) is that wake's cost. Raw percents go
+    through _smooth_percents first, which corrects readings (including
+    short bursts of them) that are wild outliers against their own local
+    neighborhood -- see that function's docstring for why that catches
+    noise shapes _reject_outlier_drops can't. A step where percent went
+    *up* is a recharge, not negative drain, and is skipped entirely
+    rather than folded in as a weird outlier; a flat step (0% change)
+    still counts as a real, cheap wake -- excluding those would
+    systematically overstate the per-wake cost by only counting the
+    wakes that happened to tick the percentage down. The remaining steps
+    then get one more pass, _reject_outlier_drops, to catch whatever
+    single-noisy-reading shape survives smoothing (see that function's
+    docstring). Steps are weighted linearly by recency (step i of n gets
+    weight i, 1-indexed) so a recent change in usage pattern shows up
+    quickly instead of being washed out by a long flat history.
 
     The resulting %/wake rate is then converted to wall-clock time using
     the frame's *current* refresh_interval_s and quiet-hours settings
@@ -220,6 +273,7 @@ def battery_estimate_s(frame: Frame, db: Session) -> int | None:
     if len(rows) < MIN_ESTIMATE_SAMPLES + 1:
         return None
     percents = list(reversed(rows))  # chronological order
+    percents = _smooth_percents(percents)
 
     steps: list[tuple[int, float]] = []  # (recency_weight, drop_pct)
     for i in range(1, len(percents)):

server/app/routers/device.py

@@ -14,6 +14,7 @@ from __future__ import annotations
 
 import logging
 import time
+from concurrent.futures import ThreadPoolExecutor
 
 from fastapi import APIRouter, Depends, HTTPException, Request
 from fastapi.responses import FileResponse, Response
@@ -23,7 +24,7 @@ from sqlalchemy.orm import Session
 
 from .. import grid, mail, quiet_hours
 from ..auth import get_server_settings, require_device
-from ..db import frame_locked, get_db
+from ..db import SessionLocal, frame_locked, get_db
 from ..firmware import firmware_path
 from ..global_actions import GLOBAL_ACTIONS
 from ..image_pipeline import draw_widget_border, logical_render_size, render_panel, render_placeholder, resolve_border_color
@@ -43,7 +44,7 @@ router = APIRouter()
 
 
 def _setup_placeholder(frame: Frame, request: Request, manage: dict | None = None,
-                       as_png: bool = False) -> bytes:
+                       as_png: bool = False, capture_snapshot: bool = False) -> bytes | tuple[bytes, bytes]:
     """What an unclaimed or widget-less frame displays instead of real
     content -- instructions with a QR, rendered at 200 so the device
     treats it as a perfectly normal image and never error-loops. The
@@ -60,6 +61,7 @@ def _setup_placeholder(frame: Frame, request: Request, manage: dict | None = Non
             palette_rgb=frame.palette_rgb,
             manage=manage,
             as_png=as_png,
+            capture_snapshot=capture_snapshot,
         )
     if frame.owner_user_id is None:
         return render_placeholder(
@@ -68,6 +70,7 @@ def _setup_placeholder(frame: Frame, request: Request, manage: dict | None = Non
             palette_rgb=frame.palette_rgb,
             manage=manage,
             as_png=as_png,
+            capture_snapshot=capture_snapshot,
         )
     return render_placeholder(
         ["Almost there!", "Add a widget for this frame at", base],
@@ -76,11 +79,46 @@ def _setup_placeholder(frame: Frame, request: Request, manage: dict | None = Non
         palette_rgb=frame.palette_rgb,
         manage=manage,
         as_png=as_png,
+        capture_snapshot=capture_snapshot,
     )
 
 
+def _render_one_widget(frame_id: int, widget_id: int, orientation: str, panel_w: int, panel_h: int,
+                       cell: tuple[int, int, int, int], is_normal_wake: bool,
+                       ) -> tuple[tuple[int, int, int, int], object] | None:
+    """Renders exactly one widget on its own DB session, so several of
+    these can run concurrently in a thread pool -- see app/db.py's
+    module docstring: handlers already run multi-threaded (sync
+    handlers in FastAPI's threadpool, one process), and frame_locked/
+    widget_locked's per-frame threading.Lock is what makes that safe,
+    not anything about which Session object is in play. A SQLAlchemy
+    Session itself is never safe to share across threads, so each
+    concurrent render gets a fresh one rather than reusing the
+    request's. Most of a widget's render time is spent waiting on an
+    external call (Immich, a weather provider, CalDAV) with the DB
+    untouched, which is exactly the time this buys back."""
+    db = SessionLocal()
+    try:
+        frame = db.get(Frame, frame_id)
+        widget = db.get(Widget, widget_id)
+        if widget is None:
+            return None  # deleted between the listing query and this fetch -- skip it, not a 500
+        module = WIDGET_TYPES.get(widget.widget_type)
+        if module is None:
+            return None  # unrecognized widget_type -- shouldn't happen, skip defensively rather than 500
+        px, py, pw, ph = grid.cell_to_pixels(orientation, panel_w, panel_h, cell)
+        img = module.render(db, frame, widget, pw, ph, is_normal_wake=is_normal_wake)
+        draw_widget_border(
+            img, widget.border_style, widget.border_thickness,
+            resolve_border_color(widget.border_color_index, frame.palette_rgb),
+        )
+        return (px, py, pw, ph), img
+    finally:
+        db.close()
+
+
 def _render_widgets(db: Session, frame: Frame, manage: dict | None, is_normal_wake: bool,
-                    as_png: bool = False) -> bytes:
+                    as_png: bool = False, capture_snapshot: bool = False) -> bytes | tuple[bytes, bytes]:
     """The widget-system compositor: renders every widget on this frame
     into its own region (see app/grid.py for grid-cell -> pixel math),
     draws that widget's own optional border directly onto its region
@@ -89,34 +127,46 @@ def _render_widgets(db: Session, frame: Frame, manage: dict | None, is_normal_wa
     image_pipeline.render_panel for the single shared paste/enhance/
     overlay/quantize/pack pass. Replaces the old per-mode RENDERERS
     dict -- a frame can now show several widgets at once instead of
-    exactly one mode owning the whole panel."""
+    exactly one mode owning the whole panel.
+
+    Widgets render concurrently (_render_one_widget, each on its own DB
+    session) rather than one at a time -- a layout with several
+    network-backed widgets (photos, weather, calendar) previously paid
+    their fetch latency serially, which could push a single /frame/*
+    response past the firmware's fixed HTTP timeout and show a
+    misleading "server failed" status screen even though the server
+    was simply still working. Futures are submitted in sort_order and
+    collected in that same order (not completion order) -- overlapping
+    widgets must still paint in the original z-order."""
     all_widgets = db.scalars(
         select(Widget).where(Widget.frame_id == frame.id).order_by(Widget.sort_order)
     ).all()
     panel_w, panel_h = logical_render_size(frame.orientation)
     regions = []
-    for widget in all_widgets:
-        module = WIDGET_TYPES.get(widget.widget_type)
-        if module is None:
-            continue  # unrecognized widget_type -- shouldn't happen, skip defensively rather than 500
-        px, py, pw, ph = grid.cell_to_pixels(
-            frame.orientation, panel_w, panel_h, (widget.x, widget.y, widget.w, widget.h)
-        )
-        img = module.render(db, frame, widget, pw, ph, is_normal_wake=is_normal_wake)
-        draw_widget_border(
-            img, widget.border_style, widget.border_thickness,
-            resolve_border_color(widget.border_color_index, frame.palette_rgb),
-        )
-        regions.append(((px, py, pw, ph), img))
+    if all_widgets:
+        with ThreadPoolExecutor(max_workers=min(len(all_widgets), 8)) as pool:
+            futures = [
+                pool.submit(
+                    _render_one_widget, frame.id, widget.id, frame.orientation, panel_w, panel_h,
+                    (widget.x, widget.y, widget.w, widget.h), is_normal_wake,
+                )
+                for widget in all_widgets
+            ]
+            for future in futures:
+                result = future.result()
+                if result is not None:
+                    regions.append(result)
     return render_panel(
         regions, orientation=frame.orientation, palette_rgb=frame.palette_rgb,
         color_boost=frame.color_boost, contrast_boost=frame.contrast_boost,
         dither_strength=frame.dither_strength, manage=manage, as_png=as_png,
+        capture_snapshot=capture_snapshot,
     )
 
 
 def _render_frame_content(db: Session, frame: Frame, request: Request | None, manage: dict | None,
-                          is_normal_wake: bool, as_png: bool = False) -> bytes:
+                          is_normal_wake: bool, as_png: bool = False,
+                          capture_snapshot: bool = False) -> bytes | tuple[bytes, bytes]:
     """The top-level "what does this frame show right now" entry point.
     An unclaimed frame or one with no widgets yet gets the setup
     placeholder (needs `request` for its QR URLs -- only available on the
@@ -134,11 +184,11 @@ def _render_frame_content(db: Session, frame: Frame, request: Request | None, ma
         if request is None:
             return render_placeholder(
                 ["Almost there!"], orientation=frame.orientation, palette_rgb=frame.palette_rgb,
-                manage=manage, as_png=as_png,
+                manage=manage, as_png=as_png, capture_snapshot=capture_snapshot,
             )
-        return _setup_placeholder(frame, request, manage=manage, as_png=as_png)
+        return _setup_placeholder(frame, request, manage=manage, as_png=as_png, capture_snapshot=capture_snapshot)
 
-    return _render_widgets(db, frame, manage, is_normal_wake, as_png=as_png)
+    return _render_widgets(db, frame, manage, is_normal_wake, as_png=as_png, capture_snapshot=capture_snapshot)
 
 
 def render_frame_preview_png(db: Session, frame: Frame, request: Request) -> bytes:
@@ -245,6 +295,17 @@ def _manage_flag(request: Request) -> bool:
     return request.query_params.get("manage") == "1"
 
 
+def _record_last_displayed(db: Session, frame: Frame, png_snapshot: bytes) -> None:
+    """Persists exactly what a device-facing render just sent (upright
+    PNG, manage overlay included if present -- whatever's actually on the
+    panel) as this frame's "now displaying" snapshot, the frozen half of
+    the web UI's header preview pair (see api_frames.py's /now-displaying
+    endpoint and its always-live "up next" counterpart, /preview)."""
+    with frame_locked(db, frame.id) as locked:
+        locked.last_displayed_image = png_snapshot
+        locked.last_displayed_at = time.time()
+
+
 @router.get("/frame/image")
 def frame_image(
     request: Request, frame: Frame = Depends(require_device), db: Session = Depends(get_db)
@@ -262,9 +323,14 @@ def frame_image(
     ?manage=1 (the manage button) composites the manage overlay onto
     whatever this would have returned anyway -- see build_manage_content.
     This is also the "normal wake" that resets any calendar widget's
-    browse position back to today (see app/widgets/calendar.py)."""
+    browse position back to today (see app/widgets/calendar.py).
+
+    Also records what's returned as this frame's "now displaying"
+    snapshot (see _record_last_displayed) -- every other device-facing
+    render endpoint below does the same."""
     manage = build_manage_content(db, frame, request) if _manage_flag(request) else None
-    content = _render_frame_content(db, frame, request, manage, is_normal_wake=True)
+    content, snapshot = _render_frame_content(db, frame, request, manage, is_normal_wake=True, capture_snapshot=True)
+    _record_last_displayed(db, frame, snapshot)
     return Response(content=content, media_type="application/octet-stream")
 
 
@@ -277,7 +343,10 @@ def frame_advance(request: Request, frame: Frame = Depends(require_device), db:
     device's next-photo button."""
     _run_button_actions(db, frame, "next")
     manage = build_manage_content(db, frame, request) if _manage_flag(request) else None
-    content = _render_frame_content(db, frame, request=None, manage=manage, is_normal_wake=False)
+    content, snapshot = _render_frame_content(
+        db, frame, request=None, manage=manage, is_normal_wake=False, capture_snapshot=True
+    )
+    _record_last_displayed(db, frame, snapshot)
     return Response(content=content, media_type="application/octet-stream")
 
 
@@ -288,7 +357,10 @@ def frame_back(request: Request, frame: Frame = Depends(require_device), db: Ses
     with nothing to go back to. Used by the device's back-photo button."""
     _run_button_actions(db, frame, "back")
     manage = build_manage_content(db, frame, request) if _manage_flag(request) else None
-    content = _render_frame_content(db, frame, request=None, manage=manage, is_normal_wake=False)
+    content, snapshot = _render_frame_content(
+        db, frame, request=None, manage=manage, is_normal_wake=False, capture_snapshot=True
+    )
+    _record_last_displayed(db, frame, snapshot)
     return Response(content=content, media_type="application/octet-stream")
 
 
@@ -303,7 +375,10 @@ def frame_global_next(request: Request, frame: Frame = Depends(require_device),
     firmware/main/next_button.c for the short/long split."""
     _run_global_action(db, frame, "next")
     manage = build_manage_content(db, frame, request) if _manage_flag(request) else None
-    content = _render_frame_content(db, frame, request=None, manage=manage, is_normal_wake=False)
+    content, snapshot = _render_frame_content(
+        db, frame, request=None, manage=manage, is_normal_wake=False, capture_snapshot=True
+    )
+    _record_last_displayed(db, frame, snapshot)
     return Response(content=content, media_type="application/octet-stream")
 
 
@@ -312,7 +387,10 @@ def frame_global_back(request: Request, frame: Frame = Depends(require_device),
     """The mirror of /frame/global-next, for a held BACK button."""
     _run_global_action(db, frame, "back")
     manage = build_manage_content(db, frame, request) if _manage_flag(request) else None
-    content = _render_frame_content(db, frame, request=None, manage=manage, is_normal_wake=False)
+    content, snapshot = _render_frame_content(
+        db, frame, request=None, manage=manage, is_normal_wake=False, capture_snapshot=True
+    )
+    _record_last_displayed(db, frame, snapshot)
     return Response(content=content, media_type="application/octet-stream")
 
 

server/app/routers/frame_pages.py

@@ -17,7 +17,7 @@ from fastapi.templating import Jinja2Templates
 from sqlalchemy import select
 from sqlalchemy.orm import Session
 
-from .. import weather
+from .. import theme_tokens, weather
 from ..auth import can_view_frame, current_user
 from ..calendar_render import CALENDAR_VIEW_LABELS
 from ..db import get_db
@@ -25,6 +25,7 @@ from ..global_actions import GLOBAL_ACTION_LABELS
 from ..image_pipeline import (
     BORDER_STYLES,
     BORDER_STYLE_LABELS,
+    CALIBRATED_SPECTRA6_RGB,
     DEFAULT_PALETTE_RGB,
     DISPLAY_MODE_LABELS,
     MAX_BORDER_THICKNESS,
@@ -89,9 +90,11 @@ def frame_config_page(frame_id: int, request: Request, db: Session = Depends(get
         timezones=ALL_TIMEZONES,
         palette_labels=PALETTE_LABELS,
         default_palette_rgb=DEFAULT_PALETTE_RGB,
+        calibrated_spectra6_hex=palette_to_hex(CALIBRATED_SPECTRA6_RGB),
         palette_to_hex=palette_to_hex,
         photo_widget_id=photo_widget_id,
         global_action_labels=GLOBAL_ACTION_LABELS,
+        themes=theme_tokens.THEMES,
     )
 
 
@@ -304,6 +307,7 @@ def widget_dialog(frame_id: int, widget_id: int, request: Request, db: Session =
         )
         return templates.TemplateResponse("_widget_dialog_whiteboard.html", {
             "request": request, "frame": frame, "widget": widget, "user": user,
+            "whiteboard_cfg": whiteboard_cfg,
             "whiteboard_source": _whiteboard_source_info(db, whiteboard_cfg),
             "viewer_has_webdav_creds": viewer_has_webdav_creds, **border_ctx, **button_ctx,
         })

server/app/routers/pages.py

@@ -13,7 +13,7 @@ import logging
 import time
 
 from fastapi import APIRouter, Depends, Form, HTTPException, Request
-from fastapi.responses import HTMLResponse, RedirectResponse
+from fastapi.responses import FileResponse, HTMLResponse, RedirectResponse
 from fastapi.templating import Jinja2Templates
 from sqlalchemy import select
 from sqlalchemy.orm import Session
@@ -35,6 +35,7 @@ from ..auth import (
     verify_password,
 )
 from ..db import get_db
+from ..logging_setup import LOG_PATH, read_log_tail
 from ..models import Frame, PasswordResetToken, PendingClaim, User, UserFrame
 from .common import valid_http_url
 
@@ -569,6 +570,7 @@ def _render_admin(request: Request, db: Session, admin: User, notice: str | None
         "smtp": get_server_settings(db),
         "notice": notice,
         "error": error,
+        "active_admin_tab": "main",
     })
     return templates.TemplateResponse("admin.html", ctx)
 
@@ -583,6 +585,35 @@ def admin_page(request: Request, db: Session = Depends(get_db)):
     return _render_admin(request, db, user)
 
 
+@router.get("/admin/logs", response_class=HTMLResponse)
+def admin_logs_page(request: Request, lines: int = 500, db: Session = Depends(get_db)):
+    user = current_user(request, db)
+    if user is None:
+        return RedirectResponse("/login", status_code=303)
+    if not user.is_admin:
+        raise HTTPException(403, "Admin only")
+    from .common import shell_context
+
+    lines = max(50, min(lines, 5000))
+    ctx = shell_context(request, db, user, active_nav="admin")
+    ctx.update({
+        "active_admin_tab": "logs",
+        "log_exists": LOG_PATH.exists(),
+        "log_path": str(LOG_PATH),
+        "log_lines": lines,
+        "log_text": read_log_tail(lines),
+    })
+    return templates.TemplateResponse("admin_logs.html", ctx)
+
+
+@router.get("/admin/logs/download")
+def admin_logs_download(request: Request, db: Session = Depends(get_db)):
+    _require_admin_page(request, db)
+    if not LOG_PATH.exists():
+        raise HTTPException(404, "No log file yet")
+    return FileResponse(LOG_PATH, filename="server.log", media_type="text/plain")
+
+
 @router.post("/admin/users", response_class=HTMLResponse)
 def admin_create_user(
     request: Request,

server/app/static/common.js

@@ -58,6 +58,15 @@
   }
 })();
 
+// Registering this is what makes Chrome/Android offer the "Add to Home
+// screen" install prompt -- a manifest link alone isn't enough. Served
+// from /sw.js (not /static/sw.js) so its scope is the whole app.
+if ("serviceWorker" in navigator) {
+  window.addEventListener("load", function () {
+    navigator.serviceWorker.register("/sw.js");
+  });
+}
+
 // Shared display names for widget_type, everywhere one shows up in the
 // UI (Layout canvas, Add-a-widget buttons, button-assignment dropdowns).
 const WIDGET_LABELS = {

server/app/static/device_status_bar.js

@@ -18,6 +18,14 @@ function renderDeviceStatusBar(device) {
   }
   const now = Date.now() / 1000;
   const rows = [];
+  if (device.expected_next_checkin) {
+    const remaining = device.expected_next_checkin - now;
+    rows.push([
+      'Expected in',
+      remaining > 0 ? `~${formatDuration(remaining)}` : 'Any moment',
+      device.overdue,
+    ]);
+  }
   const ago = formatDuration(Math.max(0, now - device.last_seen));
   rows.push(['Last seen', `${ago} ago`, device.overdue]);
   if (device.firmware_version) {

server/app/static/frame_config.js

@@ -114,7 +114,7 @@ async function loadControl() {
 
 document.getElementById('take-control').addEventListener('click', takeControl);
 
-// ---- Advanced configuration: color palette ----
+// ---- Advanced configuration: color palette(s) ----
 //
 // Hex field and R/G/B number fields are kept in sync live, both
 // directions -- editing either updates the other plus the preview
@@ -122,9 +122,15 @@ document.getElementById('take-control').addEventListener('click', takeControl);
 // the server already validates as #rrggbb); the R/G/B fields are purely
 // an alternate, more precise way to arrive at the same value than
 // eyeballing a color-picker swatch.
+//
+// Parameterized by classPrefix ("palette" for the main one, "photo-
+// palette" for the photos-only one added alongside it) rather than
+// duplicated wholesale -- there are exactly two real instances of this,
+// not a speculative future one, and the two would otherwise be ~90
+// near-identical lines apart.
 
-function paletteHexInputs() {
-  return Array.from(document.querySelectorAll('.palette-hex'))
+function paletteHexInputs(classPrefix) {
+  return Array.from(document.querySelectorAll(`.${classPrefix}-hex`))
     .sort((a, b) => Number(a.dataset.index) - Number(b.dataset.index));
 }
 
@@ -140,45 +146,53 @@ function rgbFromHex(hex) {
   return [(n >> 16) & 255, (n >> 8) & 255, n & 255];
 }
 
-function paletteFieldsFor(index) {
+function paletteFieldsFor(classPrefix, index) {
   const at = (cls) => document.querySelector(`.${cls}[data-index="${index}"]`);
-  return { hex: at('palette-hex'), r: at('palette-r'), g: at('palette-g'), b: at('palette-b'), swatch: at('palette-swatch-preview') };
+  return {
+    hex: at(`${classPrefix}-hex`), r: at(`${classPrefix}-r`), g: at(`${classPrefix}-g`), b: at(`${classPrefix}-b`),
+    swatch: at(`${classPrefix}-swatch-preview`),
+  };
 }
 
-function syncPaletteFromHex(index) {
-  const f = paletteFieldsFor(index);
+function syncPaletteFromHex(classPrefix, index) {
+  const f = paletteFieldsFor(classPrefix, index);
   const rgb = rgbFromHex(f.hex.value);
   if (!rgb) return;
   [f.r.value, f.g.value, f.b.value] = rgb;
   f.swatch.style.background = f.hex.value;
 }
 
-function syncPaletteFromRgb(index) {
-  const f = paletteFieldsFor(index);
+function syncPaletteFromRgb(classPrefix, index) {
+  const f = paletteFieldsFor(classPrefix, index);
   const hex = hexFromRgb(f.r.value, f.g.value, f.b.value);
   f.hex.value = hex;
   f.swatch.style.background = hex;
 }
 
-const palettePickerCount = paletteHexInputs().length;
-for (let i = 0; i < palettePickerCount; i++) {
-  const f = paletteFieldsFor(i);
-  f.hex.addEventListener('input', () => syncPaletteFromHex(i));
-  [f.r, f.g, f.b].forEach((el) => el.addEventListener('input', () => syncPaletteFromRgb(i)));
+function wirePaletteInputs(classPrefix) {
+  const count = paletteHexInputs(classPrefix).length;
+  for (let i = 0; i < count; i++) {
+    const f = paletteFieldsFor(classPrefix, i);
+    f.hex.addEventListener('input', () => syncPaletteFromHex(classPrefix, i));
+    [f.r, f.g, f.b].forEach((el) => el.addEventListener('input', () => syncPaletteFromRgb(classPrefix, i)));
+  }
 }
 
+wirePaletteInputs('palette');
+wirePaletteInputs('photo-palette');
+
 // Sliders: live numeric readout next to each, no save until the button
 // below is clicked.
-['color_boost', 'contrast_boost', 'dither_strength'].forEach((id) => {
+['color_boost', 'contrast_boost', 'dither_strength', 'photo_dither_strength'].forEach((id) => {
   const input = document.getElementById(id);
   const readout = document.getElementById(`${id}_value`);
   input.addEventListener('input', () => { readout.textContent = Number(input.value).toFixed(2); });
 });
 
-async function savePalette(extra) {
+async function savePalette(classPrefix, paletteFormKey, extra) {
   const body = new URLSearchParams(extra || {});
-  for (const input of paletteHexInputs()) {
-    body.append('palette', input.value);
+  for (const input of paletteHexInputs(classPrefix)) {
+    body.append(paletteFormKey, input.value);
   }
   try {
     const resp = await fetch(`${window.FRAME_API}/config`, {
@@ -195,7 +209,7 @@ async function savePalette(extra) {
 }
 
 document.getElementById('palette-save').addEventListener('click', () => {
-  savePalette({
+  savePalette('palette', 'palette', {
     color_boost: document.getElementById('color_boost').value,
     contrast_boost: document.getElementById('contrast_boost').value,
     dither_strength: document.getElementById('dither_strength').value,
@@ -203,16 +217,65 @@ document.getElementById('palette-save').addEventListener('click', () => {
 });
 
 document.getElementById('palette-reset').addEventListener('click', () => {
-  const inputs = paletteHexInputs();
+  const inputs = paletteHexInputs('palette');
   window.DEFAULT_PALETTE_HEX.forEach((hex, i) => {
     inputs[i].value = hex;
-    syncPaletteFromHex(i);
+    syncPaletteFromHex('palette', i);
   });
   ['color_boost', 'contrast_boost', 'dither_strength'].forEach((id) => {
     document.getElementById(id).value = '1';
     document.getElementById(`${id}_value`).textContent = '1.00';
   });
-  savePalette({ palette_reset: 'true', color_boost: '1', contrast_boost: '1', dither_strength: '1' });
+  savePalette('palette', 'palette', { palette_reset: 'true', color_boost: '1', contrast_boost: '1', dither_strength: '1' });
+});
+
+// Fills the table with a community-measured starting point (see the
+// card's own explanatory text) -- doesn't save by itself, same as
+// editing the hex/RGB fields by hand; the user still clicks Save (or
+// Reset) to commit or discard it.
+document.getElementById('palette-load-calibrated').addEventListener('click', () => {
+  const inputs = paletteHexInputs('palette');
+  window.CALIBRATED_SPECTRA6_HEX.forEach((hex, i) => {
+    inputs[i].value = hex;
+    syncPaletteFromHex('palette', i);
+  });
+});
+
+// ---- Photos configuration: its own separate palette/dithering ----
+
+document.getElementById('photo-palette-save').addEventListener('click', () => {
+  savePalette('photo-palette', 'photo_palette', {
+    photo_dither_strength: document.getElementById('photo_dither_strength').value,
+  });
+});
+
+document.getElementById('photo-palette-reset').addEventListener('click', () => {
+  const inputs = paletteHexInputs('photo-palette');
+  window.DEFAULT_PALETTE_HEX.forEach((hex, i) => {
+    inputs[i].value = hex;
+    syncPaletteFromHex('photo-palette', i);
+  });
+  document.getElementById('photo_dither_strength').value = '1';
+  document.getElementById('photo_dither_strength_value').textContent = '1.00';
+  savePalette('photo-palette', 'photo_palette', { photo_palette_reset: 'true', photo_dither_strength: '1' });
+});
+
+// ---- Theme ----
+
+document.getElementById('theme-save').addEventListener('click', async () => {
+  const body = new URLSearchParams({ theme: document.getElementById('theme-select').value });
+  try {
+    const resp = await fetch(`${window.FRAME_API}/config`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+      body,
+    });
+    if (!resp.ok) throw new Error(await apiError(resp));
+    showStatus(true, 'Saved.');
+    loadPreview();
+  } catch (e) {
+    showStatus(false, e.message);
+  }
 });
 
 // ---- Preview: current photo vs. how it renders with saved settings ----
@@ -339,8 +402,15 @@ async function loadFirmwareCheck(force) {
       statusEl.textContent = 'Waiting for the frame to check in before it can look up the right build.';
       btn.style.display = 'none';
     } else if (data.update_available) {
-      statusEl.textContent = `Update available: v${data.latest_version}.`;
+      statusEl.textContent = `Update available: v${data.latest_version}` +
+        (data.running_version ? ` (currently running v${data.running_version}).` : '.');
       btn.style.display = 'inline-block';
+    } else if (data.latest_version && data.running_version && data.running_version !== data.latest_version) {
+      // Already staged (or auto-applied) but the frame hasn't woken up
+      // and picked it up yet -- not "up to date" until it actually has.
+      statusEl.textContent = `v${data.latest_version} staged -- applies next time the frame wakes ` +
+        `(currently running v${data.running_version}).`;
+      btn.style.display = 'none';
     } else if (data.latest_version) {
       statusEl.textContent = `Up to date (v${data.latest_version}).`;
       btn.style.display = 'none';

server/app/static/frame_header.js

@@ -58,48 +58,31 @@
   });
 })();
 
-// Live "how it's displaying" thumbnail. A real composite render (same
-// pipeline /frame/image uses), not a cached snapshot, so it's on a slow
-// poll rather than something tighter like the 10s device-status poll --
-// no need to hit Immich/calendar/whiteboard sources that often just for
-// a header thumbnail. Click enlarges it in a dialog (which also fetches
-// a fresh render); clicking the enlarged image refreshes it again.
+// Now-displaying / up-next header preview pair. "Up next" is a real
+// composite render (same pipeline /frame/image uses), not a cached
+// snapshot, so it's on a slow poll rather than something tighter like
+// the 10s device-status poll -- no need to hit Immich/calendar/
+// whiteboard sources that often just for a header thumbnail, and it
+// shows layout edits live as they're made. "Now displaying" is the
+// opposite: exactly the bytes last actually sent to the device (see
+// routers/device.py's _record_last_displayed), frozen until the
+// device's next real wake even while the layout is being edited live --
+// that contrast is the point of showing both side by side.
 (function () {
-  var thumb = document.getElementById('frame-preview-thumb');
-  var dialog = document.getElementById('frame-preview-dialog');
-  var bigImg = document.getElementById('frame-preview-dialog-img');
-  var closeBtn = document.getElementById('frame-preview-dialog-close');
-  if (!thumb || !window.FRAME_BASE_API) return;
+  var nextThumb = document.getElementById('frame-preview-thumb');
+  var nextDialog = document.getElementById('frame-preview-dialog');
+  var nextBigImg = document.getElementById('frame-preview-dialog-img');
+  var nextCloseBtn = document.getElementById('frame-preview-dialog-close');
+  var nowThumb = document.getElementById('frame-preview-now-thumb');
+  var nowDialog = document.getElementById('frame-preview-now-dialog');
+  var nowBigImg = document.getElementById('frame-preview-now-dialog-img');
+  var nowCloseBtn = document.getElementById('frame-preview-now-dialog-close');
+  if (!nextThumb || !window.FRAME_BASE_API) return;
 
-  function previewUrl() {
-    return `${window.FRAME_BASE_API}/preview?t=${Date.now()}`;
-  }
-  function refreshThumb() {
-    thumb.src = previewUrl();
-  }
-  // Opening the dialog (or clicking the big image inside it) fetches a
-  // fresh render and keeps the header thumb in sync, so this single path
-  // covers both "enlarge" and the old click-to-refresh behavior.
-  function refreshBig() {
-    var url = previewUrl();
-    bigImg.src = url;
-    thumb.src = url;
-  }
-
-  thumb.addEventListener('click', function () {
-    if (!dialog) { refreshThumb(); return; }
-    refreshBig();
-    dialog.showModal();
-  });
-  refreshThumb();
-  setInterval(refreshThumb, 60000);
-
-  if (dialog && bigImg && closeBtn) {
-    bigImg.addEventListener('click', refreshBig);
-    closeBtn.addEventListener('click', function () { dialog.close(); });
-    // Same backdrop-click-to-close trick as #widget-dialog: a click that
-    // lands on the dialog element itself (not its content box) means the
-    // backdrop was hit.
+  // Same backdrop-click-to-close trick as #widget-dialog: a click that
+  // lands on the dialog element itself (not its content box) means the
+  // backdrop was hit.
+  function closeOnBackdropClick(dialog) {
     dialog.addEventListener('click', function (e) {
       if (e.target !== dialog) return;
       var rect = dialog.getBoundingClientRect();
@@ -107,4 +90,80 @@
       if (!inside) dialog.close();
     });
   }
+
+  function nextUrl() {
+    return `${window.FRAME_BASE_API}/preview?t=${Date.now()}`;
+  }
+  function refreshNext() {
+    nextThumb.src = nextUrl();
+  }
+  // Opening the dialog (or clicking the big image inside it) fetches a
+  // fresh render and keeps the header thumb in sync, so this single path
+  // covers both "enlarge" and the old click-to-refresh behavior.
+  function refreshNextBig() {
+    var url = nextUrl();
+    nextBigImg.src = url;
+    nextThumb.src = url;
+  }
+
+  nextThumb.addEventListener('click', function () {
+    if (!nextDialog) { refreshNext(); return; }
+    refreshNextBig();
+    nextDialog.showModal();
+  });
+  refreshNext();
+  setInterval(refreshNext, 60000);
+
+  if (nextDialog && nextBigImg && nextCloseBtn) {
+    nextBigImg.addEventListener('click', refreshNextBig);
+    nextCloseBtn.addEventListener('click', function () { nextDialog.close(); });
+    closeOnBackdropClick(nextDialog);
+  }
+
+  // "Now displaying" fetches rather than sets .src directly: it needs to
+  // tell a 404 (device hasn't fetched yet) apart from a real image to
+  // show its own empty state instead of a broken-image icon, and reads
+  // the capture time off X-Displayed-At for the "N ago" tooltip.
+  if (nowThumb) {
+    var nowObjectUrl = null;
+    function refreshNow() {
+      fetch(`${window.FRAME_BASE_API}/now-displaying?t=${Date.now()}`)
+        .then(function (resp) {
+          if (!resp.ok) {
+            nowThumb.classList.add('frame-preview-thumb-empty');
+            nowThumb.removeAttribute('src');
+            nowThumb.title = "Now displaying -- hasn't shown anything yet";
+            return null;
+          }
+          var displayedAt = resp.headers.get('X-Displayed-At');
+          nowThumb.title = displayedAt
+            ? `Now displaying -- ${formatDuration(Math.max(0, Date.now() / 1000 - parseFloat(displayedAt)))} ago -- click to enlarge`
+            : 'Now displaying -- click to enlarge';
+          return resp.blob();
+        })
+        .then(function (blob) {
+          if (!blob) return;
+          nowThumb.classList.remove('frame-preview-thumb-empty');
+          var url = URL.createObjectURL(blob);
+          var old = nowObjectUrl;
+          nowObjectUrl = url;
+          nowThumb.src = url;
+          if (old) URL.revokeObjectURL(old);
+        })
+        .catch(function () { /* transient failure -- leave the last-known thumb showing */ });
+    }
+
+    nowThumb.addEventListener('click', function () {
+      if (nowThumb.classList.contains('frame-preview-thumb-empty') || !nowDialog) return;
+      nowBigImg.src = nowThumb.src;
+      nowDialog.showModal();
+    });
+    refreshNow();
+    setInterval(refreshNow, 60000);
+
+    if (nowDialog && nowCloseBtn) {
+      nowCloseBtn.addEventListener('click', function () { nowDialog.close(); });
+      closeOnBackdropClick(nowDialog);
+    }
+  }
 })();

server/app/static/manifest.json

@@ -0,0 +1,14 @@
+{
+  "name": "ESPresso Frame",
+  "short_name": "ESPresso",
+  "description": "Manage your e-ink photo frames.",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "background_color": "#f5f6f8",
+  "theme_color": "#2563eb",
+  "icons": [
+    { "src": "/static/icons/icon-192.png", "sizes": "192x192", "type": "image/png" },
+    { "src": "/static/icons/icon-512.png", "sizes": "512x512", "type": "image/png" }
+  ]
+}

server/app/static/sw.js

@@ -0,0 +1,8 @@
+// Presence-only service worker: satisfies the "installable" requirement
+// (Chrome/Android in particular checks for a controlling SW with a fetch
+// handler) without adding an offline cache -- every request just goes to
+// the network as normal. Served from / (see app/main.py's /sw.js route)
+// so its scope covers the whole app, not just /static/.
+self.addEventListener("install", () => self.skipWaiting());
+self.addEventListener("activate", (event) => event.waitUntil(self.clients.claim()));
+self.addEventListener("fetch", (event) => event.respondWith(fetch(event.request)));

server/app/static/theme.css

@@ -156,6 +156,24 @@ button.linklike:hover { color: var(--text); background: none; }
 .admin-inline-form { display: flex; gap: 8px; align-items: center; margin-top: 6px; }
 .admin-inline-form input[type="text"] { margin-top: 0; flex: 1; }
 
+.log-view-controls { display: flex; gap: 10px; align-items: center; margin: 10px 0; font-size: 13px; }
+.log-view-controls a:not(.btn-inline) { color: var(--text-muted); }
+.log-view-controls a.active { color: var(--accent); font-weight: 600; }
+.log-view {
+  background: var(--surface-alt);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  padding: 12px;
+  max-height: 65vh;
+  overflow: auto;
+  white-space: pre-wrap;
+  word-break: break-all;
+  font-family: ui-monospace, "SF Mono", Consolas, monospace;
+  font-size: 12.5px;
+  line-height: 1.5;
+  color: var(--text);
+}
+
 h2.card-title, summary.card-title {
   font-size: 14.5px;
   font-weight: 650;
@@ -243,6 +261,36 @@ input[type="range"] {
 }
 .card + .card { margin-top: 20px; }
 
+/* Installed as a standalone app, the boxed-card look reads as "still a
+   website" -- flatten page-level cards into the page background so it
+   feels native. Cards inside the widget dialog keep their box: they're
+   grouping subsections of one form, not top-level page furniture. */
+@media (display-mode: standalone) {
+  .card {
+    background: transparent;
+    border: none;
+    border-radius: 0;
+    box-shadow: none;
+    padding: 20px 0;
+  }
+  .card + .card {
+    margin-top: 4px;
+    padding-top: 24px;
+    border-top: 1px solid var(--border);
+  }
+  #widget-dialog-body .card {
+    background: var(--surface);
+    border: 1px solid var(--border);
+    border-radius: 14px;
+    padding: 20px 22px 22px;
+  }
+  #widget-dialog-body .card + .card {
+    margin-top: 20px;
+    padding-top: 22px;
+    border-top: none;
+  }
+}
+
 label { display: block; margin-top: 16px; font-size: 13px; font-weight: 600; color: var(--text); }
 label:first-child { margin-top: 0; }
 
@@ -719,13 +767,24 @@ code {
 }
 .frame-name-edit button { margin-top: 0; }
 
+.frame-preview-pair {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  margin-left: 12px;
+  vertical-align: middle;
+}
+.frame-preview-arrow {
+  color: var(--text-muted);
+  font-size: 16px;
+  line-height: 1;
+}
 .frame-preview-thumb {
   height: 44px;
   width: auto;
   max-width: 130px;
   object-fit: contain;
   vertical-align: middle;
-  margin-left: 12px;
   border: 1px solid var(--border);
   border-radius: 4px;
   background: var(--surface-alt);
@@ -733,6 +792,13 @@ code {
   transition: opacity .12s ease;
 }
 .frame-preview-thumb:hover { opacity: 0.8; }
+.frame-preview-thumb-empty {
+  opacity: 0.3;
+  cursor: default;
+  width: 60px;
+  font-size: 0; /* no src yet -- suppresses the browser's fallback alt-text render */
+}
+.frame-preview-thumb-empty:hover { opacity: 0.3; }
 
 .frame-preview-dialog {
   position: fixed;

server/app/static/widget_dialog_battery.js

@@ -13,6 +13,7 @@ function initBatteryDialog() {
     e.preventDefault();
     const body = new URLSearchParams({
       battery_mode: document.getElementById('battery_mode').value,
+      battery_render_style: document.getElementById('battery_render_style').value,
     });
     try {
       const resp = await fetch(`${window.FRAME_API}/config`, {

server/app/static/widget_dialog_calendar.js

@@ -81,6 +81,7 @@ function initCalendarDialog() {
       calendar_week_days: document.getElementById('calendar_week_days').value,
       calendar_week_layout: document.getElementById('calendar_week_layout').value,
       calendar_week_start_offset: document.getElementById('calendar_week_start_offset').value,
+      calendar_render_style: document.getElementById('calendar_render_style').value,
     });
     try {
       const resp = await fetch(`${window.FRAME_API}/config`, {

server/app/static/widget_dialog_static.js

@@ -38,6 +38,7 @@ function initStaticDialog() {
     e.preventDefault();
     const body = new URLSearchParams({
       display_mode: document.getElementById('display_mode').value,
+      static_render_style: document.getElementById('static_render_style').value,
     });
     try {
       const resp = await fetch(`${window.FRAME_API}/config`, {

server/app/static/widget_dialog_tasks.js

@@ -71,6 +71,7 @@ function initTasksDialog() {
     const body = new URLSearchParams({
       tasks_name: document.getElementById('tasks_name').value,
       tasks_show_completed: String(document.getElementById('tasks_show_completed').checked),
+      tasks_render_style: document.getElementById('tasks_render_style').value,
     });
     try {
       const resp = await fetch(`${window.FRAME_API}/config`, {

server/app/static/widget_dialog_text.js

@@ -113,6 +113,7 @@ function initTextDialog() {
       text_font_size: document.getElementById('text_font_size').value,
       text_align: document.getElementById('text_align').value,
       text_background_color: document.getElementById('text_background_color').value,
+      text_render_style: document.getElementById('text_render_style').value,
     });
     try {
       const resp = await fetch(`${window.FRAME_API}/config`, {

server/app/static/widget_dialog_weather.js

@@ -14,6 +14,12 @@ function updateWeatherFieldVisibility() {
   document.getElementById('weather-daily-days-row').style.display = mode === 'daily' ? '' : 'none';
   document.getElementById('weather-location-section').style.display = mode === 'multi_city' ? 'none' : '';
   document.getElementById('weather-cities-section').style.display = mode === 'multi_city' ? '' : 'none';
+  // Modern style is only built for current/daily (see app/html_render.py) --
+  // hourly/multi_city always render classic server-side regardless of this
+  // setting, so hide the row entirely rather than offer a choice that's a
+  // silent no-op.
+  document.getElementById('weather-render-style-row').style.display =
+    (mode === 'current' || mode === 'daily') ? '' : 'none';
 }
 
 function addWeatherWidgetCityRow(label) {
@@ -74,6 +80,7 @@ function initWeatherDialog() {
       weather_units: document.getElementById('weather_units').value,
       weather_hourly_interval_hours: document.getElementById('weather_hourly_interval_hours').value,
       weather_daily_days: document.getElementById('weather_daily_days').value,
+      weather_render_style: document.getElementById('weather_render_style').value,
     });
     try {
       const resp = await fetch(`${window.FRAME_API}/config`, {

server/app/static/widget_dialog_whiteboard.js

@@ -90,6 +90,25 @@ function initWhiteboardDialog() {
     whiteboardClearBtn.addEventListener('click', clearWhiteboardSource);
   }
 
+  document.getElementById('whiteboard-config-form').addEventListener('submit', async (e) => {
+    e.preventDefault();
+    const body = new URLSearchParams({
+      whiteboard_render_style: document.getElementById('whiteboard_render_style').value,
+    });
+    try {
+      const resp = await fetch(`${window.FRAME_API}/config`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+        body,
+      });
+      if (!resp.ok) throw new Error(await apiError(resp));
+      showStatus(true, 'Saved.');
+      loadWhiteboardPreview(false);
+    } catch (e) {
+      showStatus(false, e.message);
+    }
+  });
+
   // Shows whatever's already cached (cheap, no refetch) on open; the
   // button is the one place that means "no really, go check now" --
   // bypasses the fetch throttle server-side (see api_widget_preview_

server/app/templates/_admin_tabs.html

@@ -0,0 +1,4 @@
+<nav class="tabs">
+  <a href="/admin" class="{% if active_admin_tab == 'main' %}active{% endif %}">Users &amp; Frames</a>
+  <a href="/admin/logs" class="{% if active_admin_tab == 'logs' %}active{% endif %}">Server Logs</a>
+</nav>

server/app/templates/_frame_name_edit.html

@@ -7,10 +7,19 @@
   <button type="button" class="btn-inline" id="frame-name-save">Save</button>
   <button type="button" class="btn-inline secondary" id="frame-name-cancel">Cancel</button>
 </span>
-<img id="frame-preview-thumb" class="frame-preview-thumb" alt="Live preview of what the frame is displaying" title="What the frame is currently displaying -- click to enlarge">
+<span class="frame-preview-pair">
+  <img id="frame-preview-now-thumb" class="frame-preview-thumb frame-preview-thumb-empty" alt="What the frame is currently displaying" title="Now displaying">
+  <span class="frame-preview-arrow" aria-hidden="true">&rarr;</span>
+  <img id="frame-preview-thumb" class="frame-preview-thumb" alt="Live preview of what the frame will show next" title="Up next -- live preview, updates as you edit the layout -- click to enlarge">
+</span>
+
+<dialog id="frame-preview-now-dialog" class="frame-preview-dialog">
+  <button type="button" id="frame-preview-now-dialog-close" class="icon-btn" aria-label="Close" title="Close">&times;</button>
+  <img id="frame-preview-now-dialog-img" alt="What the frame is currently displaying">
+</dialog>
 
 <dialog id="frame-preview-dialog" class="frame-preview-dialog">
   <button type="button" id="frame-preview-dialog-close" class="icon-btn" aria-label="Close" title="Close">&times;</button>
-  <img id="frame-preview-dialog-img" alt="Live preview of what the frame is displaying" title="Click to refresh">
+  <img id="frame-preview-dialog-img" alt="Live preview of what the frame will show next" title="Click to refresh">
 </dialog>
 

server/app/templates/_widget_dialog_battery.html

@@ -11,6 +11,12 @@
         <option value="detailed" {% if not battery_cfg or battery_cfg.mode == 'detailed' %}selected{% endif %}>Detailed (+ estimated time left, last report)</option>
       </select>
     </label>
+    <label>Render style
+      <select id="battery_render_style">
+        <option value="classic" {% if not battery_cfg or battery_cfg.render_style == 'classic' %}selected{% endif %}>Classic (hand-drawn icon)</option>
+        <option value="modern" {% if battery_cfg and battery_cfg.render_style == 'modern' %}selected{% endif %}>Modern (experimental)</option>
+      </select>
+    </label>
     <button type="submit">Save</button>
   </form>
 </section>

server/app/templates/_widget_dialog_calendar.html

@@ -40,6 +40,12 @@
       <p class="sub" style="margin-top: 4px;">0 = starts today, negative = starts in the
         past, positive = starts in the future. Only used when Days to show isn't 7.</p>
     </div>
+    <label>Render style
+      <select id="calendar_render_style">
+        <option value="classic" {% if calendar_cfg.render_style == 'classic' %}selected{% endif %}>Classic (hand-drawn)</option>
+        <option value="modern" {% if calendar_cfg.render_style == 'modern' %}selected{% endif %}>Modern (experimental, all views)</option>
+      </select>
+    </label>
     <button type="submit">Save</button>
   </form>
 

server/app/templates/_widget_dialog_static.html

@@ -32,6 +32,12 @@
       exactly without cropping (an image with a different aspect ratio
       looks stretched); <strong>Shrink to fit</strong> shows the whole
       image, letterboxed if needed.</p>
+    <label>Render style
+      <select id="static_render_style">
+        <option value="classic" {% if not static_cfg or static_cfg.render_style == 'classic' %}selected{% endif %}>Classic (no frame)</option>
+        <option value="modern" {% if static_cfg and static_cfg.render_style == 'modern' %}selected{% endif %}>Modern (rounded-corner card, experimental)</option>
+      </select>
+    </label>
     <button type="submit">Save</button>
   </form>
 </section>

server/app/templates/_widget_dialog_tasks.html

@@ -55,6 +55,12 @@
       <input type="checkbox" id="tasks_show_completed" {% if task_cfg.show_completed %}checked{% endif %}>
       <label for="tasks_show_completed">Also show tasks completed in the last 24 hours</label>
     </div>
+    <label>Render style
+      <select id="tasks_render_style">
+        <option value="classic" {% if task_cfg.render_style == 'classic' %}selected{% endif %}>Classic (hand-drawn checklist)</option>
+        <option value="modern" {% if task_cfg.render_style == 'modern' %}selected{% endif %}>Modern (experimental)</option>
+      </select>
+    </label>
     <button type="submit">Save</button>
   </form>
 </section>

server/app/templates/_widget_dialog_text.html

@@ -43,6 +43,12 @@
     <label>Background color
       <input type="color" id="text_background_color" value="{{ text_cfg.background_color if text_cfg else '#ffffff' }}">
     </label>
+    <label>Render style
+      <select id="text_render_style">
+        <option value="classic" {% if not text_cfg or text_cfg.render_style == 'classic' %}selected{% endif %}>Classic (hand-drawn text)</option>
+        <option value="modern" {% if text_cfg and text_cfg.render_style == 'modern' %}selected{% endif %}>Modern (experimental)</option>
+      </select>
+    </label>
     <button type="submit">Save</button>
   </form>
 </section>

server/app/templates/_widget_dialog_weather.html

@@ -11,6 +11,14 @@
         <option value="multi_city" {% if weather_cfg.mode == "multi_city" %}selected{% endif %}>Multiple cities</option>
       </select>
     </label>
+    <div id="weather-render-style-row">
+      <label>Render style
+        <select id="weather_render_style">
+          <option value="classic" {% if weather_cfg.render_style == "classic" %}selected{% endif %}>Classic (hand-drawn icons)</option>
+          <option value="modern" {% if weather_cfg.render_style == "modern" %}selected{% endif %}>Modern (experimental, current/daily only)</option>
+        </select>
+      </label>
+    </div>
     <label>Weather source
       <select id="weather_provider">
         {% for value, label in weather_provider_labels.items() %}

server/app/templates/_widget_dialog_whiteboard.html

@@ -50,6 +50,19 @@
   {% endif %}
 </section>
 
+<section class="card" style="margin-top: 20px;">
+  <h2 class="card-title">Settings</h2>
+  <form id="whiteboard-config-form">
+    <label>Render style
+      <select id="whiteboard_render_style">
+        <option value="classic" {% if not whiteboard_cfg or whiteboard_cfg.render_style == 'classic' %}selected{% endif %}>Classic (no frame)</option>
+        <option value="modern" {% if whiteboard_cfg and whiteboard_cfg.render_style == 'modern' %}selected{% endif %}>Modern (rounded-corner card, experimental)</option>
+      </select>
+    </label>
+    <button type="submit">Save</button>
+  </form>
+</section>
+
 {% include "_widget_border_fields.html" %}
 
 {% include "_widget_button_fields.html" %}

server/app/templates/admin.html

@@ -4,6 +4,8 @@
 {% block page_title %}Administration{% endblock %}
 
 {% block content %}
+  {% include "_admin_tabs.html" %}
+
   {% if notice %}<div class="status ok">{{ notice }}</div>{% endif %}
   {% if error %}<div class="status err">{{ error }}</div>{% endif %}
 

server/app/templates/admin_logs.html

@@ -0,0 +1,30 @@
+{% extends "app_base.html" %}
+
+{% block title %}Server Logs{% endblock %}
+{% block page_title %}Administration{% endblock %}
+
+{% block content %}
+  {% include "_admin_tabs.html" %}
+
+  <section class="card">
+    <div class="card-title-row">
+      <h2 class="card-title">Server Logs</h2>
+      <a href="/admin/logs/download" class="secondary btn-inline">Download full log</a>
+    </div>
+
+    {% if not log_exists %}
+      <p class="sub">No log file yet -- nothing has been logged since this server last started.</p>
+    {% else %}
+      <p class="sub">Last {{ log_lines }} lines of <code>{{ log_path }}</code>. Rotates at ~2MB
+        (older entries roll into <code>{{ log_path }}.1</code>, etc. -- not shown here; use
+        "Download full log" for just the current file).</p>
+      <div class="log-view-controls">
+        {% for n in [200, 500, 2000, 5000] %}
+          <a href="/admin/logs?lines={{ n }}" class="{% if log_lines == n %}active{% endif %}">{{ n }}</a>
+        {% endfor %}
+        <a href="/admin/logs?lines={{ log_lines }}" class="secondary btn-inline">Refresh</a>
+      </div>
+      <pre class="log-view">{{ log_text }}</pre>
+    {% endif %}
+  </section>
+{% endblock %}

server/app/templates/app_base.html

@@ -17,6 +17,14 @@
     })();
   </script>
   <link rel="stylesheet" href="/static/theme.css">
+  <link rel="manifest" href="/static/manifest.json">
+  <link rel="icon" href="/static/icons/favicon.png">
+  <link rel="apple-touch-icon" href="/static/icons/apple-touch-icon.png">
+  <meta name="theme-color" content="#2563eb">
+  <meta name="mobile-web-app-capable" content="yes">
+  <meta name="apple-mobile-web-app-capable" content="yes">
+  <meta name="apple-mobile-web-app-status-bar-style" content="default">
+  <meta name="apple-mobile-web-app-title" content="ESPresso">
   {% block extra_head %}{% endblock %}
 </head>
 <body>

server/app/templates/base.html

@@ -17,6 +17,14 @@
     })();
   </script>
   <link rel="stylesheet" href="/static/theme.css">
+  <link rel="manifest" href="/static/manifest.json">
+  <link rel="icon" href="/static/icons/favicon.png">
+  <link rel="apple-touch-icon" href="/static/icons/apple-touch-icon.png">
+  <meta name="theme-color" content="#2563eb">
+  <meta name="mobile-web-app-capable" content="yes">
+  <meta name="apple-mobile-web-app-capable" content="yes">
+  <meta name="apple-mobile-web-app-status-bar-style" content="default">
+  <meta name="apple-mobile-web-app-title" content="ESPresso">
   {% block extra_head %}{% endblock %}
 </head>
 <body>

server/app/templates/frame_config.html

@@ -139,11 +139,12 @@
 
       <details class="card">
         <summary class="card-title">Advanced configuration</summary>
-        <p class="sub">Color-quantization values used when dithering photos
-          for this panel -- approximations by default, since exact primaries
-          aren't published. Tune them by comparing a rendered photo against
-          the physical panel; different panel units can vary enough to be
-          worth calibrating per frame.</p>
+        <p class="sub">Color-quantization values used for every widget
+          <strong>except photos</strong> (which has its own separate
+          settings below) -- approximations by default, since exact
+          primaries aren't published. Tune them by comparing a rendered
+          widget against the physical panel; different panel units can
+          vary enough to be worth calibrating per frame.</p>
         <div class="palette-table-wrap">
           <table class="palette-table">
             <thead><tr><th></th><th>Color</th><th>Hex</th><th>R</th><th>G</th><th>B</th></tr></thead>
@@ -187,6 +188,68 @@
 
         <button type="button" class="secondary" id="palette-save" style="margin-top: 16px;">Save</button>
         <button type="button" class="secondary" id="palette-reset">Reset to defaults</button>
+        <button type="button" class="secondary" id="palette-load-calibrated">Load calibrated Spectra 6 preset</button>
+        <p class="sub" style="margin-top: 8px;">Experimental: a community-measured
+          starting point (not this specific panel) -- fills the table above,
+          doesn't save by itself. Real Spectra 6 ink is duller than the
+          idealized defaults; this may or may not match your actual unit.
+          Compare against the physical panel before keeping it.</p>
+      </details>
+
+      <details class="card">
+        <summary class="card-title">Theme</summary>
+        <p class="sub">A curated visual style for widgets using the
+          "modern" (experimental) render style -- font, corner radius,
+          shadow, and header accent. Widgets rendered in the classic
+          style are unaffected. Photos are unaffected too (see Photos
+          configuration below).</p>
+        <label>Theme
+          <select id="theme-select">
+            {% for key, t in themes.items() %}
+              <option value="{{ key }}" {% if frame.theme == key %}selected{% endif %}>{{ t.label }}</option>
+            {% endfor %}
+          </select>
+        </label>
+        <button type="button" class="secondary" id="theme-save" style="margin-top: 16px;">Save</button>
+      </details>
+
+      <details class="card">
+        <summary class="card-title">Photos configuration</summary>
+        <p class="sub">Palette and dithering used <strong>only</strong> by
+          the photos widget, independent of Advanced configuration above --
+          lets you tune the rest of this frame's widgets (e.g. a "modern"
+          HTML-rendered look) without changing what looks best for actual
+          photographs, or vice versa.</p>
+        <div class="palette-table-wrap">
+          <table class="palette-table">
+            <thead><tr><th></th><th>Color</th><th>Hex</th><th>R</th><th>G</th><th>B</th></tr></thead>
+            <tbody>
+              {% set current_photo_palette = frame.photo_palette_rgb or default_palette_rgb %}
+              {% set current_photo_hex = palette_to_hex(current_photo_palette) %}
+              {% for label in palette_labels %}
+                <tr>
+                  <td><span class="photo-palette-swatch-preview" data-index="{{ loop.index0 }}"
+                            style="background: {{ current_photo_hex[loop.index0] }};"></span></td>
+                  <td>{{ label }}</td>
+                  <td><input type="text" class="photo-palette-hex" id="photo_palette_{{ loop.index0 }}" data-index="{{ loop.index0 }}"
+                             value="{{ current_photo_hex[loop.index0] }}" maxlength="7" pattern="#[0-9a-fA-F]{6}"
+                             spellcheck="false" autocomplete="off"></td>
+                  <td><input type="number" class="photo-palette-rgb photo-palette-r" data-index="{{ loop.index0 }}"
+                             min="0" max="255" value="{{ current_photo_palette[loop.index0][0] }}"></td>
+                  <td><input type="number" class="photo-palette-rgb photo-palette-g" data-index="{{ loop.index0 }}"
+                             min="0" max="255" value="{{ current_photo_palette[loop.index0][1] }}"></td>
+                  <td><input type="number" class="photo-palette-rgb photo-palette-b" data-index="{{ loop.index0 }}"
+                             min="0" max="255" value="{{ current_photo_palette[loop.index0][2] }}"></td>
+                </tr>
+              {% endfor %}
+            </tbody>
+          </table>
+        </div>
+        <label>Dithering strength <span class="slider-value" id="photo_dither_strength_value">{{ "%.2f" | format(frame.photo_dither_strength) }}</span>
+          <input type="range" id="photo_dither_strength" min="0" max="1" step="0.05" value="{{ frame.photo_dither_strength }}">
+        </label>
+        <button type="button" class="secondary" id="photo-palette-save" style="margin-top: 16px;">Save</button>
+        <button type="button" class="secondary" id="photo-palette-reset">Reset to defaults</button>
       </details>
 
       <section class="card">
@@ -221,6 +284,7 @@
   <script>
     window.FRAME_BASE_API = window.FRAME_API = {{ ("/api/frames/" ~ frame.id) | tojson }};
     window.DEFAULT_PALETTE_HEX = {{ palette_to_hex(default_palette_rgb) | tojson }};
+    window.CALIBRATED_SPECTRA6_HEX = {{ calibrated_spectra6_hex | tojson }};
     window.PHOTO_WIDGET_PREVIEW_API = {{ (("/api/frames/" ~ frame.id ~ "/widgets/" ~ photo_widget_id) | tojson) if photo_widget_id else "null" }};
   </script>
   <script src="/static/device_status_bar.js"></script>

server/app/templates/widget_html/_calendar_day_section.html.jinja

@@ -0,0 +1,32 @@
+{% macro day_section(header, weather_entries, weather_size, unit_suffix, rows, more_count, row_h, body_size, title_size, accent_start, accent_end, header_h) %}
+  <div class="day-section">
+    {#- Fixed height (not auto) -- every stacked day-section's header
+        must be exactly this tall regardless of whether THIS particular
+        day has a weather entry, or days with/without weather misalign
+        where their event rows start (see calendar_week_horizontal's
+        identical fix/reasoning). #}
+    <div class="day-header" style="background: linear-gradient(135deg, {{ accent_start }} 0%, {{ accent_end }} 100%); font-size: {{ title_size }}px; height: {{ header_h }}px;">
+      <div class="day-header-title">{{ header }}</div>
+      {% if weather_entries %}
+        <div class="day-weather-row" style="font-size: {{ weather_size }}px;">
+          {% for we in weather_entries %}
+            <div class="day-weather-entry"><span class="day-weather-icon" style="font-size: {{ weather_size * 1.3 }}px;">{{ we.emoji }}</span><span>{{ we.high }}&deg;/{{ we.low }}&deg;{{ unit_suffix }}</span></div>
+          {% endfor %}
+        </div>
+      {% endif %}
+    </div>
+    <div class="day-rows">
+      {% if not rows and not more_count %}
+        <div class="day-empty" style="font-size: {{ body_size }}px;">Nothing scheduled</div>
+      {% endif %}
+      {% for row in rows %}
+        <div class="day-row" style="height: {{ row_h }}px;">
+          <div class="day-chip">{% for c in row.colors %}<span style="background:{{ c }};"></span>{% endfor %}</div>
+          <div class="day-time" style="font-size: {{ body_size }}px;">{{ row.time }}</div>
+          <div class="day-summary" style="font-size: {{ body_size }}px;">{{ row.summary }}</div>
+        </div>
+      {% endfor %}
+      {% if more_count %}<div class="day-more" style="font-size: {{ body_size }}px;">+{{ more_count }} more</div>{% endif %}
+    </div>
+  </div>
+{% endmacro %}

server/app/templates/widget_html/battery.html.jinja

@@ -0,0 +1,53 @@
+<!doctype html>
+<html><head><style>
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_regular }}"); font-weight: 400; }
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_bold }}"); font-weight: 700; }
+  * { margin: 0; padding: 0; box-sizing: border-box; font-family: "ThemeFont", sans-serif; }
+  body { width: {{ w }}px; height: {{ h }}px; background: #ffffff; }
+  .card {
+    width: {{ w - gutter * 2 }}px;
+    height: {{ h - gutter * 2 }}px;
+    margin: {{ gutter }}px;
+    border-radius: {{ radius }}px;
+    overflow: hidden;
+    background: #ffffff;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    gap: 8px;
+  }
+  .icon-wrap { display: flex; align-items: center; }
+  .icon-body {
+    width: {{ icon_w }}px;
+    height: {{ icon_h }}px;
+    border: {{ stroke }}px solid #000000;
+    border-radius: {{ icon_radius }}px;
+    padding: {{ stroke }}px;
+    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
+  }
+  .icon-fill {
+    width: {{ fill_pct }}%;
+    height: 100%;
+    border-radius: {{ fill_radius }}px;
+    background: linear-gradient(180deg, {{ fill_color }}, {{ fill_color_dark }});
+  }
+  .icon-nub {
+    width: {{ nub_w }}px;
+    height: {{ nub_h }}px;
+    background: #000000;
+    border-radius: 0 {{ nub_radius }}px {{ nub_radius }}px 0;
+  }
+  .pct { font-weight: 700; font-size: {{ pct_size }}px; line-height: 1; color: {{ fill_color }}; }
+  .line { font-weight: 400; font-size: {{ line_size }}px; line-height: 1; color: #5b6674; }
+</style></head>
+<body>
+  <div class="card">
+    <div class="icon-wrap">
+      <div class="icon-body"><div class="icon-fill"></div></div>
+      <div class="icon-nub"></div>
+    </div>
+    <div class="pct">{{ percent }}%</div>
+    {% for line in lines %}<div class="line">{{ line }}</div>{% endfor %}
+  </div>
+</body></html>

server/app/templates/widget_html/calendar_agenda.html.jinja

@@ -0,0 +1,36 @@
+<!doctype html>
+<html><head><style>
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_regular }}"); font-weight: 400; }
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_bold }}"); font-weight: 700; }
+  * { margin: 0; padding: 0; box-sizing: border-box; font-family: "ThemeFont", sans-serif; }
+  body { width: {{ w }}px; height: {{ h }}px; background: #ffffff; }
+  .card {
+    width: {{ w - gutter * 2 }}px;
+    height: {{ h - gutter * 2 }}px;
+    margin: {{ gutter }}px;
+    border-radius: {{ radius }}px;
+    overflow: hidden;
+    {% if shadow %}box-shadow: 0 4px 14px rgba(0, 20, 60, 0.2);{% endif %}
+    background: #ffffff;
+    display: flex;
+    flex-direction: column;
+  }
+  .day-section { display: flex; flex-direction: column; flex: 1 1 auto; min-height: 0; }
+  .day-header { flex: 0 0 auto; color: #ffffff; font-weight: 700; line-height: 1.2; padding: 10px 16px; overflow: hidden; }
+  .day-weather-row { display: flex; gap: 14px; margin-top: 6px; }
+  .day-weather-entry { display: flex; align-items: center; gap: 4px; color: rgba(255,255,255,0.9); }
+  .day-weather-icon { line-height: 1; }
+  .day-rows { flex: 1 1 auto; padding: 8px 14px; overflow: hidden; }
+  .day-row { display: flex; align-items: center; gap: 8px; }
+  .day-chip { display: flex; height: 12px; width: 10px; border-radius: 3px; overflow: hidden; flex: 0 0 auto; }
+  .day-chip span { flex: 1 1 0; }
+  .day-time { color: #5b6674; flex: 0 0 auto; white-space: nowrap; }
+  .day-summary { color: #17233b; line-height: 1.2; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
+  .day-empty, .day-more { color: #5b6674; padding-top: 4px; }
+</style></head>
+<body>
+  {% import "_calendar_day_section.html.jinja" as ds %}
+  <div class="card">
+    {{ ds.day_section(header, weather_entries, weather_size, unit_suffix, rows, more_count, row_h, body_size, title_size, accent_start, accent_end, header_h) }}
+  </div>
+</body></html>

server/app/templates/widget_html/calendar_month.html.jinja

@@ -0,0 +1,65 @@
+<!doctype html>
+<html><head><style>
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_regular }}"); font-weight: 400; }
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_bold }}"); font-weight: 700; }
+  * { margin: 0; padding: 0; box-sizing: border-box; font-family: "ThemeFont", sans-serif; }
+  body { width: {{ w }}px; height: {{ h }}px; background: #ffffff; }
+  .card {
+    width: {{ w - gutter * 2 }}px;
+    height: {{ h - gutter * 2 }}px;
+    margin: {{ gutter }}px;
+    border-radius: {{ radius }}px;
+    overflow: hidden;
+    {% if shadow %}box-shadow: 0 4px 14px rgba(0, 20, 60, 0.2);{% endif %}
+    background: #ffffff;
+    display: flex;
+    flex-direction: column;
+  }
+  .weekday-row { display: flex; flex: 0 0 auto; background: {{ accent_start }}; }
+  .weekday-cell { flex: 1 1 0; color: #ffffff; font-weight: 700; font-size: {{ header_size }}px; text-align: center; padding: 4px 0; }
+  .weeks { flex: 1 1 auto; display: flex; flex-direction: column; }
+  .week-row { flex: 1 1 0; display: flex; }
+  .day-cell { flex: 1 1 0; border: 1px solid #e2e6ec; padding: 4px; min-width: 0; overflow: hidden; }
+  {#- Bold everywhere, including out-of-month -- de-emphasis is via
+      smaller size only, not weight or a gray color. Regular-weight and
+      gray text are both individually fragile under Bayer ordered
+      dithering at small sizes (thin/low-contrast anti-aliased edges
+      have little "mass" to survive the bias+threshold step), and this
+      cell combined both, which degraded out-of-month day numbers into
+      unrecognizable speckle -- classic PIL's own de-emphasis trick
+      (weight instead of gray, see calendar_render._build_month's
+      docstring) doesn't transfer safely to this render path. #}
+  .day-num { font-size: {{ day_size }}px; font-weight: 700; color: #17233b; }
+  .day-num.out-of-month { font-size: {{ day_size * 0.8 }}px; }
+  .day-num.today {
+    display: inline-block; background: {{ accent_start }}; color: #ffffff;
+    border-radius: 4px; padding: 0 4px;
+  }
+  .dots { display: flex; gap: 3px; margin-top: 3px; align-items: center; flex-wrap: wrap; }
+  .dot { width: {{ dot_size }}px; height: {{ dot_size }}px; border-radius: 50%; flex: 0 0 auto; }
+  .dot-more { font-size: {{ day_size * 0.8 }}px; color: #5b6674; }
+</style></head>
+<body>
+  <div class="card">
+    <div class="weekday-row">
+      {% for name in day_names %}<div class="weekday-cell">{{ name }}</div>{% endfor %}
+    </div>
+    <div class="weeks">
+      {% for week in weeks %}
+        <div class="week-row">
+          {% for day in week %}
+            <div class="day-cell">
+              <span class="day-num {% if day.is_today %}today{% elif not day.in_month %}out-of-month{% endif %}">{{ day.day_num }}</span>
+              {% if day.dots %}
+                <div class="dots">
+                  {% for c in day.dots %}<div class="dot" style="background:{{ c }};"></div>{% endfor %}
+                  {% if day.more_count %}<span class="dot-more">+{{ day.more_count }}</span>{% endif %}
+                </div>
+              {% endif %}
+            </div>
+          {% endfor %}
+        </div>
+      {% endfor %}
+    </div>
+  </div>
+</body></html>

server/app/templates/widget_html/calendar_today_tomorrow.html.jinja

@@ -0,0 +1,39 @@
+<!doctype html>
+<html><head><style>
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_regular }}"); font-weight: 400; }
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_bold }}"); font-weight: 700; }
+  * { margin: 0; padding: 0; box-sizing: border-box; font-family: "ThemeFont", sans-serif; }
+  body { width: {{ w }}px; height: {{ h }}px; background: #ffffff; }
+  .card {
+    width: {{ w - gutter * 2 }}px;
+    height: {{ h - gutter * 2 }}px;
+    margin: {{ gutter }}px;
+    border-radius: {{ radius }}px;
+    overflow: hidden;
+    {% if shadow %}box-shadow: 0 4px 14px rgba(0, 20, 60, 0.2);{% endif %}
+    background: #ffffff;
+    display: flex;
+    flex-direction: column;
+  }
+  .day-section { display: flex; flex-direction: column; flex: 1 1 0; min-height: 0; overflow: hidden; }
+  .day-section + .day-section { border-top: 1px solid #e2e6ec; }
+  .day-header { flex: 0 0 auto; color: #ffffff; font-weight: 700; line-height: 1.2; padding: 8px 16px; overflow: hidden; }
+  .day-weather-row { display: flex; gap: 14px; margin-top: 4px; }
+  .day-weather-entry { display: flex; align-items: center; gap: 4px; color: rgba(255,255,255,0.9); }
+  .day-weather-icon { line-height: 1; }
+  .day-rows { flex: 1 1 auto; padding: 6px 14px; overflow: hidden; }
+  .day-row { display: flex; align-items: center; gap: 8px; }
+  .day-chip { display: flex; height: 12px; width: 10px; border-radius: 3px; overflow: hidden; flex: 0 0 auto; }
+  .day-chip span { flex: 1 1 0; }
+  .day-time { color: #5b6674; flex: 0 0 auto; white-space: nowrap; }
+  .day-summary { color: #17233b; line-height: 1.2; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
+  .day-empty, .day-more { color: #5b6674; padding-top: 2px; }
+</style></head>
+<body>
+  {% import "_calendar_day_section.html.jinja" as ds %}
+  <div class="card">
+    {% for day in days %}
+      {{ ds.day_section(day.header, day.weather_entries, weather_size, unit_suffix, day.rows, day.more_count, row_h, body_size, title_size, accent_start, accent_end, header_h) }}
+    {% endfor %}
+  </div>
+</body></html>

server/app/templates/widget_html/calendar_week_horizontal.html.jinja

@@ -0,0 +1,60 @@
+<!doctype html>
+<html><head><style>
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_regular }}"); font-weight: 400; }
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_bold }}"); font-weight: 700; }
+  * { margin: 0; padding: 0; box-sizing: border-box; font-family: "ThemeFont", sans-serif; }
+  body { width: {{ w }}px; height: {{ h }}px; background: #ffffff; }
+  .card {
+    width: {{ w - gutter * 2 }}px;
+    height: {{ h - gutter * 2 }}px;
+    margin: {{ gutter }}px;
+    border-radius: {{ radius }}px;
+    overflow: hidden;
+    {% if shadow %}box-shadow: 0 4px 14px rgba(0, 20, 60, 0.2);{% endif %}
+    background: #ffffff;
+    display: flex;
+  }
+  .col { flex: 1 1 0; min-width: 0; display: flex; flex-direction: column; }
+  .col + .col { border-left: 1px solid #e2e6ec; }
+  .col-header {
+    /* Fixed height (not auto) -- every column must be exactly this tall
+       regardless of whether THIS particular day has a weather entry, or
+       columns with/without weather misalign their event rows to
+       different starting Y positions across the week grid. */
+    height: {{ header_h }}px;
+    flex: 0 0 auto;
+    background: linear-gradient(135deg, {{ accent_start }} 0%, {{ accent_end }} 100%);
+    color: #ffffff; font-weight: 700; font-size: {{ header_size }}px;
+    padding: 6px 6px;
+    overflow: hidden;
+  }
+  .col-header .label { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
+  .col-weather { display: flex; align-items: center; gap: 3px; color: rgba(255,255,255,0.9); font-size: {{ weather_size }}px; margin-top: 2px; }
+  .col-rows { flex: 1 1 auto; padding: 4px; overflow: hidden; }
+  .col-row { display: flex; align-items: center; gap: 4px; min-width: 0; }
+  .col-chip { width: 7px; height: 7px; border-radius: 2px; flex: 0 0 auto; }
+  .col-summary {
+    flex: 1 1 0; min-width: 0;
+    font-size: {{ chip_size }}px; color: #17233b; line-height: 1.3;
+    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
+  }
+  .col-more { font-size: {{ chip_size }}px; color: #5b6674; }
+</style></head>
+<body>
+  <div class="card">
+    {% for col in cols %}
+      <div class="col">
+        <div class="col-header">
+          <div class="label">{{ col.label }}</div>
+          {% if col.weather %}<div class="col-weather"><span>{{ col.weather.emoji }}</span><span>{{ col.weather.high }}&deg;/{{ col.weather.low }}&deg;{{ unit_suffix }}</span></div>{% endif %}
+        </div>
+        <div class="col-rows">
+          {% for row in col.rows %}
+            <div class="col-row"><div class="col-chip" style="background:{{ row.color }};"></div><div class="col-summary">{{ row.summary }}</div></div>
+          {% endfor %}
+          {% if col.more_count %}<div class="col-more">+{{ col.more_count }}</div>{% endif %}
+        </div>
+      </div>
+    {% endfor %}
+  </div>
+</body></html>

server/app/templates/widget_html/framed_image.html.jinja

@@ -0,0 +1,27 @@
+<!doctype html>
+<html><head><style>
+  * { margin: 0; padding: 0; box-sizing: border-box; }
+  body { width: {{ w }}px; height: {{ h }}px; background: #ffffff; }
+  .card {
+    width: {{ w - gutter * 2 }}px;
+    height: {{ h - gutter * 2 }}px;
+    margin: {{ gutter }}px;
+    border-radius: {{ radius }}px;
+    overflow: hidden;
+    {% if shadow %}box-shadow: 0 4px 14px rgba(0, 20, 60, 0.25);{% endif %}
+    background: #ffffff;
+  }
+  .card img {
+    width: 100%; height: 100%; display: block;
+    /* "contain", not "cover" -- the source image already went through
+       compose_into's own crop/fit (e.g. whiteboard's deliberate
+       letterbox-never-crop mode), so this card must not re-crop it;
+       the gutter inset is small relative to typical widget sizes, so
+       "contain" leaves at most a sliver of background visible, not a
+       real letterbox. */
+    object-fit: contain;
+  }
+</style></head>
+<body>
+  <div class="card"><img src="data:image/png;base64,{{ image_b64 }}"></div>
+</body></html>

server/app/templates/widget_html/tasks.html.jinja

@@ -0,0 +1,62 @@
+<!doctype html>
+<html><head><style>
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_regular }}"); font-weight: 400; }
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_bold }}"); font-weight: 700; }
+  * { margin: 0; padding: 0; box-sizing: border-box; font-family: "ThemeFont", sans-serif; }
+  body { width: {{ w }}px; height: {{ h }}px; background: #ffffff; }
+  .card {
+    width: {{ w - gutter * 2 }}px;
+    height: {{ h - gutter * 2 }}px;
+    margin: {{ gutter }}px;
+    border-radius: {{ radius }}px;
+    overflow: hidden;
+    {% if shadow %}box-shadow: 0 4px 14px rgba(0, 20, 60, 0.2);{% endif %}
+    background: #ffffff;
+    display: flex;
+    flex-direction: column;
+  }
+  .header {
+    height: {{ header_h }}px;
+    flex: 0 0 auto;
+    background: linear-gradient(135deg, {{ accent_start }} 0%, {{ accent_end }} 100%);
+    display: flex;
+    align-items: center;
+    padding: 0 16px;
+  }
+  .header .title { color: #ffffff; font-weight: 700; font-size: {{ title_size }}px; line-height: 1; }
+  .rows { flex: 1 1 auto; padding: 8px 14px; overflow: hidden; }
+  .row { display: flex; align-items: center; gap: 8px; height: {{ row_h }}px; }
+  .chip { display: flex; height: 12px; width: 10px; border-radius: 3px; overflow: hidden; flex: 0 0 auto; }
+  .chip span { flex: 1 1 0; }
+  .box {
+    width: {{ box_size }}px; height: {{ box_size }}px; border-radius: 3px; flex: 0 0 auto;
+    border: 2px solid #17233b;
+  }
+  .box.done { border-color: {{ accent_start }}; background: {{ accent_start }}; }
+  .due { font-size: {{ body_size }}px; color: #5b6674; flex: 0 0 auto; white-space: nowrap; }
+  .summary {
+    font-size: {{ body_size }}px; color: #17233b; line-height: 1.2;
+    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
+  }
+  .empty { font-size: {{ body_size }}px; color: #5b6674; padding-top: 4px; }
+  .more { font-size: {{ body_size }}px; color: #5b6674; padding-top: 2px; }
+</style></head>
+<body>
+  <div class="card">
+    <div class="header"><div class="title">{{ title }}</div></div>
+    <div class="rows">
+      {% if not rows %}
+        <div class="empty">Nothing outstanding</div>
+      {% endif %}
+      {% for row in rows %}
+        <div class="row">
+          <div class="chip">{% for c in row.colors %}<span style="background:{{ c }};"></span>{% endfor %}</div>
+          <div class="box {% if row.done %}done{% endif %}"></div>
+          {% if row.due %}<div class="due">{{ row.due }}</div>{% endif %}
+          <div class="summary">{{ row.summary }}</div>
+        </div>
+      {% endfor %}
+      {% if more_count %}<div class="more">+{{ more_count }} more</div>{% endif %}
+    </div>
+  </div>
+</body></html>

server/app/templates/widget_html/text.html.jinja

@@ -0,0 +1,35 @@
+<!doctype html>
+<html><head><style>
+  @font-face { font-family: "TextFont"; src: url("file://{{ font_regular }}"); font-weight: 400; font-style: normal; }
+  @font-face { font-family: "TextFont"; src: url("file://{{ font_bold }}"); font-weight: 700; font-style: normal; }
+  @font-face { font-family: "TextFont"; src: url("file://{{ font_italic }}"); font-weight: 400; font-style: italic; }
+  @font-face { font-family: "TextFont"; src: url("file://{{ font_bold_italic }}"); font-weight: 700; font-style: italic; }
+  * { margin: 0; padding: 0; box-sizing: border-box; }
+  body { width: {{ w }}px; height: {{ h }}px; background: {{ bg_color }}; }
+  .wrap {
+    width: {{ w - margin * 2 }}px;
+    min-height: {{ h - margin * 2 }}px;
+    margin: {{ margin }}px;
+    font-family: "TextFont", sans-serif;
+    font-size: {{ size }}px;
+    line-height: {{ line_height }};
+    text-align: {{ align }};
+    color: #000000;
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    overflow: hidden;
+    word-wrap: break-word;
+  }
+  p { min-height: 1em; }
+</style></head>
+<body>
+  <div class="wrap">
+    {% for paragraph in paragraphs %}
+      <p>
+        {% if not paragraph %}&nbsp;{% endif %}
+        {% for run in paragraph %}<span style="{% if run.bold %}font-weight:700;{% endif %}{% if run.italic %}font-style:italic;{% endif %}{% if run.underline %}text-decoration:underline;{% endif %}{% if run.color %}color:{{ run.color }};{% endif %}{% if run.bg %}background:{{ run.bg }};{% endif %}">{{ run.text }}</span>{% endfor %}
+      </p>
+    {% endfor %}
+  </div>
+</body></html>

server/app/templates/widget_html/weather_current.html.jinja

@@ -0,0 +1,30 @@
+<!doctype html>
+<html><head><style>
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_regular }}"); font-weight: 400; }
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_bold }}"); font-weight: 700; }
+  * { margin: 0; padding: 0; box-sizing: border-box; font-family: "ThemeFont", sans-serif; }
+  body { width: {{ w }}px; height: {{ h }}px; background: #ffffff; }
+  .card {
+    width: {{ w - gutter * 2 }}px;
+    height: {{ h - gutter * 2 }}px;
+    margin: {{ gutter }}px;
+    border-radius: {{ radius }}px;
+    overflow: hidden;
+    background: #ffffff;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    gap: 10px;
+  }
+  .icon { font-size: {{ icon_size }}px; line-height: 1; filter: drop-shadow(0 3px 4px rgba(0, 0, 0, 0.18)); }
+  .temp { font-weight: 700; font-size: {{ temp_size }}px; color: #17233b; }
+  .city { font-weight: 400; font-size: {{ label_size }}px; color: #5b6674; }
+</style></head>
+<body>
+  <div class="card">
+    <div class="icon">{{ emoji }}</div>
+    <div class="temp">{{ temp }}&deg;{{ unit_suffix }}</div>
+    {% if city_label %}<div class="city">{{ city_label }}</div>{% endif %}
+  </div>
+</body></html>

server/app/templates/widget_html/weather_daily.html.jinja

@@ -0,0 +1,51 @@
+<!doctype html>
+<html><head><style>
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_regular }}"); font-weight: 400; }
+  @font-face { font-family: "ThemeFont"; src: url("file://{{ font_bold }}"); font-weight: 700; }
+  * { margin: 0; padding: 0; box-sizing: border-box; font-family: "ThemeFont", sans-serif; }
+  body { width: {{ w }}px; height: {{ h }}px; background: #ffffff; }
+  .card {
+    width: {{ w - gutter * 2 }}px;
+    height: {{ h - gutter * 2 }}px;
+    margin: {{ gutter }}px;
+    border-radius: {{ radius }}px;
+    overflow: hidden;
+    {% if shadow %}box-shadow: 0 4px 14px rgba(0, 20, 60, 0.25);{% endif %}
+    background: #ffffff;
+  }
+  .header {
+    height: {{ header_h }}px;
+    background: linear-gradient(135deg, {{ accent_start }} 0%, {{ accent_end }} 100%);
+    display: flex;
+    align-items: center;
+    padding: 0 16px;
+  }
+  .header .title { color: #ffffff; font-weight: 700; font-size: {{ title_size }}px; }
+  .body { display: flex; height: calc(100% - {{ header_h }}px); padding: 12px 8px; }
+  .col {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    gap: 5px;
+  }
+  .day { font-weight: 600; font-size: {{ label_size }}px; color: #17233b; }
+  .icon { font-size: {{ icon_size }}px; line-height: 1; }
+  .temps { font-weight: 700; font-size: {{ label_size }}px; color: #17233b; }
+  .temps .low { color: #6b7788; font-weight: 400; }
+</style></head>
+<body>
+  <div class="card">
+    {% if city_label %}<div class="header"><div class="title">{{ city_label }}</div></div>{% endif %}
+    <div class="body">
+      {% for d in days %}
+      <div class="col">
+        <div class="day">{{ d.label }}</div>
+        <div class="icon">{{ d.emoji }}</div>
+        <div class="temps">{{ d.high }}&deg;<span class="low">/{{ d.low }}&deg;{{ unit_suffix }}</span></div>
+      </div>
+      {% endfor %}
+    </div>
+  </div>
+</body></html>

server/app/theme_tokens.py

@@ -0,0 +1,202 @@
+"""Curated theme presets for "modern" (HTML/CSS) style widgets, plus the
+font-family table every modern-style widget -- and widgets/text.py's own
+classic PIL path -- resolves fonts through. The font table used to be
+widgets/text.py's private property; it's hoisted here (text.py now
+imports it back) since html_render.py's build_text/build_daily/etc. all
+need to resolve a theme's font_family to real font files too, not just
+the text widget.
+
+Inspired by Tesserae's (github.com/dmellok/tesserae, AGPL-3.0) three-
+layer CSS custom-property theme system -- primitives, semantic per-
+theme tokens, component tokens -- reimplemented here as original Python/
+CSS rather than copied (see docs/widgets.md and this repo's CLAUDE.md on
+copyleft dependencies).
+
+A theme is purely **stylistic**: font family, corner radius, drop
+shadow, header gradient on/off, and an accent hue for the widgets that
+have an actual header/accent region to dither richer (see
+html_render.ordered_dither_regions). It never touches **functional**
+color-coding -- battery's charge-level red/yellow/green, calendar/tasks'
+per-owner event color chips, and text's user-authored inline run colors
+are status/identity signals, not style choices, and no theme may
+recolor them.
+
+Rich accent_hex values are not restricted to the 6 exact panel inks --
+`ordered_dither_regions` approximates them via denser Bayer stippling in
+just the accent region (verified directly: terracotta/ochre/moss/teal/
+slate-blue/plum swatches all resolve to a believable multi-ink
+approximation at amplitude ~130, the same mechanism -- spatial
+dithering, not flat quantization -- Tesserae's own calibrated-palette
+Floyd-Steinberg uses, just ordered instead of diffused)."""
+
+from __future__ import annotations
+
+from functools import lru_cache
+from pathlib import Path
+
+from PIL import ImageFont
+
+from . import panel_style
+
+_FONT_DIR = Path(__file__).resolve().parent / "fonts"
+
+# --- Font family table (hoisted from widgets/text.py) -----------------
+
+DEFAULT_FONT_FAMILY = "sans"
+FONT_FAMILIES: dict[str, str] = {
+    "sans": "Sans-serif (Noto Sans)",
+    "inter": "Inter",
+    "source_sans": "Source Sans",
+    "serif": "Serif (Noto Serif)",
+    "elegant": "Elegant serif (Crimson Text)",
+    "slab": "Slab serif (Arvo)",
+    "mono": "Monospace (IBM Plex Mono)",
+}
+_FONT_FILES = {
+    "sans": {
+        (False, False): "NotoSans-Regular.ttf", (True, False): "NotoSans-Bold.ttf",
+        (False, True): "NotoSans-Italic.ttf", (True, True): "NotoSans-BoldItalic.ttf",
+    },
+    "inter": {
+        (False, False): "Inter-Regular.ttf", (True, False): "Inter-Bold.ttf",
+        (False, True): "Inter-Italic.ttf", (True, True): "Inter-BoldItalic.ttf",
+    },
+    "source_sans": {
+        (False, False): "SourceSans3-Regular.ttf", (True, False): "SourceSans3-Bold.ttf",
+        (False, True): "SourceSans3-Italic.ttf", (True, True): "SourceSans3-BoldItalic.ttf",
+    },
+    "serif": {
+        (False, False): "NotoSerif-Regular.ttf", (True, False): "NotoSerif-Bold.ttf",
+        (False, True): "NotoSerif-Italic.ttf", (True, True): "NotoSerif-BoldItalic.ttf",
+    },
+    "elegant": {
+        (False, False): "CrimsonText-Regular.ttf", (True, False): "CrimsonText-Bold.ttf",
+        (False, True): "CrimsonText-Italic.ttf", (True, True): "CrimsonText-BoldItalic.ttf",
+    },
+    "slab": {
+        (False, False): "Arvo-Regular.ttf", (True, False): "Arvo-Bold.ttf",
+        (False, True): "Arvo-Italic.ttf", (True, True): "Arvo-BoldItalic.ttf",
+    },
+    "mono": {
+        (False, False): "IBMPlexMono-Regular.ttf", (True, False): "IBMPlexMono-Bold.ttf",
+        (False, True): "IBMPlexMono-Italic.ttf", (True, True): "IBMPlexMono-BoldItalic.ttf",
+    },
+}
+
+
+def font_path(family: str, bold: bool, italic: bool) -> Path:
+    files = _FONT_FILES.get(family) or _FONT_FILES[DEFAULT_FONT_FAMILY]
+    return _FONT_DIR / files[(bold, italic)]
+
+
+@lru_cache(maxsize=256)
+def font(family: str, bold: bool, italic: bool, size: int) -> ImageFont.FreeTypeFont:
+    return ImageFont.truetype(str(font_path(family, bold, italic)), size)
+
+
+def _rgb_to_hex(rgb: tuple[int, int, int]) -> str:
+    return "#%02x%02x%02x" % tuple(rgb)
+
+
+def _darken_hex(rgb: tuple[int, int, int], factor: float = 0.75) -> str:
+    return _rgb_to_hex(tuple(max(0, round(c * factor)) for c in rgb))
+
+
+# --- Theme presets -------------------------------------------------------
+
+DEFAULT_THEME = "classic"
+
+# accent_hex=None means "keep each widget's own classic THEME_* ink" --
+# resolve_theme() below is what actually looks that up -- so "classic" is
+# deliberately a no-visual-change default, byte-identical to how modern
+# style already rendered before this theme system existed.
+THEMES: dict[str, dict] = {
+    "classic": {
+        "label": "Classic", "accent_hex": None,
+        "font_family": "inter", "radius": panel_style.CARD_RADIUS, "shadow": True,
+        "gradient": True, "accent_amplitude": 48.0,
+    },
+    "terracotta": {
+        "label": "Terracotta", "accent_hex": "#a84b2a",
+        "font_family": "inter", "radius": panel_style.CARD_RADIUS, "shadow": True,
+        "gradient": True, "accent_amplitude": 130.0,
+    },
+    "ochre": {
+        "label": "Ochre", "accent_hex": "#b8892b",
+        "font_family": "slab", "radius": panel_style.CARD_RADIUS, "shadow": True,
+        "gradient": True, "accent_amplitude": 130.0,
+    },
+    "moss": {
+        "label": "Moss", "accent_hex": "#4f6f36",
+        "font_family": "serif", "radius": 4, "shadow": False,
+        "gradient": False, "accent_amplitude": 130.0,
+    },
+    "teal": {
+        "label": "Teal", "accent_hex": "#2b7a78",
+        "font_family": "source_sans", "radius": panel_style.CARD_RADIUS, "shadow": True,
+        "gradient": True, "accent_amplitude": 130.0,
+    },
+    "slate": {
+        "label": "Slate", "accent_hex": "#3f5a88",
+        "font_family": "inter", "radius": 0, "shadow": False,
+        "gradient": False, "accent_amplitude": 130.0,
+    },
+    "plum": {
+        "label": "Plum", "accent_hex": "#6a3b5e",
+        "font_family": "elegant", "radius": panel_style.CARD_RADIUS, "shadow": True,
+        "gradient": False, "accent_amplitude": 130.0,
+    },
+}
+
+
+# "classic" theme's accent_hex is None, meaning "keep this specific
+# widget kind's own pre-theme-system look exactly" -- for tasks/calendar
+# that's their classic THEME_TASKS/THEME_CALENDAR ink (a flat color, both
+# gradient stops equal, since neither ever had a gradient header before
+# this system existed); weather's modern style never went through
+# panel_style.THEME at all -- its header was always this fixed blue
+# gradient (see html_render.py's now-removed ACCENT_START/ACCENT_END
+# constants) -- preserved here byte-for-byte so "classic" stays a
+# genuinely no-visual-change default for every widget kind that shipped
+# before themes existed.
+_CLASSIC_WEATHER_GRADIENT = ("#1c4fd6", "#6fa8ff")
+
+
+def resolve_theme(theme_name: str | None, widget_kind: str, palette_rgb: list | None) -> dict:
+    """Concrete, ready-to-render values for one widget's modern-style
+    build_* function: accent_hex/accent_hex_dark (a gradient's two CSS
+    stops -- both equal when the theme has no gradient), font_family
+    (validated against FONT_FAMILIES) plus its resolved font_regular/
+    font_bold file paths, radius, shadow, gradient, and accent_amplitude
+    (for ordered_dither_regions' header rect -- unused by widgets that
+    dither their header at the base amplitude only, see module
+    docstring). widget_kind is one of panel_style.THEME's keys
+    ("calendar"/"tasks"/"weather") plus "battery"/"text"/"static"/
+    "whiteboard" for the widgets that have no classic THEME_* ink of
+    their own -- those fall back to BLACK when theme_name is "classic"
+    or unrecognized."""
+    theme = THEMES.get(theme_name or DEFAULT_THEME, THEMES[DEFAULT_THEME])
+    accent_hex = theme["accent_hex"]
+    if accent_hex is None:
+        if widget_kind == "weather":
+            accent_hex, accent_hex_dark = _CLASSIC_WEATHER_GRADIENT
+        else:
+            ink_index = panel_style.THEME.get(widget_kind, panel_style.BLACK)
+            accent_hex = accent_hex_dark = _rgb_to_hex(panel_style.ink(palette_rgb, ink_index))
+    else:
+        accent_hex_dark = accent_hex if not theme["gradient"] else _darken_hex(
+            tuple(int(accent_hex[i:i + 2], 16) for i in (1, 3, 5))
+        )
+    family = theme["font_family"] if theme["font_family"] in FONT_FAMILIES else DEFAULT_FONT_FAMILY
+    return {
+        "theme_name": theme_name if theme_name in THEMES else DEFAULT_THEME,
+        "accent_hex": accent_hex,
+        "accent_hex_dark": accent_hex_dark,
+        "font_family": family,
+        "font_regular": str(font_path(family, False, False)),
+        "font_bold": str(font_path(family, True, False)),
+        "radius": theme["radius"],
+        "shadow": theme["shadow"],
+        "gradient": theme["gradient"],
+        "accent_amplitude": theme["accent_amplitude"],
+    }

server/app/weather_render.py

@@ -33,23 +33,27 @@ from datetime import date, datetime
 
 from PIL import Image, ImageDraw, ImageFont
 
-from .image_pipeline import DEFAULT_PALETTE_RGB, _apply_manage_overlay, _quantize, draw_text, logical_render_size
+from . import panel_style
+from .image_pipeline import _apply_manage_overlay, _quantize, draw_text, logical_render_size
 
-MARGIN = 20
+# MARGIN carries panel_style.CONTENT_MARGIN's value unchanged (not
+# re-tuned -- every column-width/icon-size calc below was measured
+# against 20px). BG/FG are this module's own cloud-icon fill/outline and
+# fog-line color (see draw_cloud/draw_weather_icon), not a text-emphasis
+# concern -- those live in panel_style (font_bold/font_regular, no MUTED
+# gray -- see its module docstring for why).
+MARGIN = panel_style.CONTENT_MARGIN
 BG = (255, 255, 255)
 FG = (0, 0, 0)
-MUTED = (110, 110, 110)
-RULE = (0, 0, 0)
 
 
 def _ink(palette_rgb: list | None, index: int) -> tuple[int, int, int]:
     """One of this frame's actual panel colors by DEFAULT_PALETTE_RGB
     index (2=yellow, 3=red, 4=blue, 5=green -- 0/1 are black/white,
-    already this module's BG/FG) -- same resolution idiom as
-    calendar_render.py's _event_colors, so a custom palette override
-    (Frame.palette_rgb) still gets its own actual yellow/blue, and every
-    fill stays an exact, ditherless palette match either way."""
-    return tuple((palette_rgb or DEFAULT_PALETTE_RGB)[index])
+    already this module's BG/FG) -- thin wrapper over panel_style.ink
+    (which generalized this same resolution idiom), kept so every
+    draw_weather_icon call site below doesn't need touching."""
+    return panel_style.ink(palette_rgb, index)
 
 
 def draw_cloud(draw: ImageDraw.ImageDraw, cx: float, cy: float, r: float, fill=BG, outline=FG) -> None:
@@ -203,14 +207,17 @@ def _format_hour_label(iso_time: str) -> str:
 
 
 def _fit_font_size(draw: ImageDraw.ImageDraw, texts: list[str], max_width: int, max_size: int,
-                   min_size: int = 9) -> int:
+                   min_size: int = 9, font_loader=panel_style.font_bold) -> int:
     """Largest size <= max_size at which every string in `texts` fits
     within max_width -- used to size a per-column label/temp font against
     the actual column width instead of an icon-radius-derived guess,
     which (e.g. "Tomorrow" vs. "Wed") let long labels overlap into the
-    next column at a large icon size on a narrow column."""
+    next column at a large icon size on a narrow column. Measured against
+    `font_loader` (default Inter Bold -- the wider of the two weights a
+    column actually mixes, a label in Regular and a temp in Bold, so
+    fitting against Bold keeps both safely inside max_width)."""
     for size in range(max_size, min_size - 1, -1):
-        font = ImageFont.load_default(size=size)
+        font = font_loader(size)
         if all(draw.textlength(t, font=font) <= max_width for t in texts):
             return size
     return min_size
@@ -232,29 +239,28 @@ def build_current(entry: dict | None, target_w: int, target_h: int, palette_rgb:
     (callers normally catch that earlier and show a placeholder instead,
     but this degrades to a blank canvas rather than erroring either
     way)."""
-    img = Image.new("RGB", (target_w, target_h), BG)
+    img, draw, (cx0, cy0, cw, ch) = panel_style.card_canvas(target_w, target_h)
     if not entry:
         return img
-    draw = ImageDraw.Draw(img)
 
-    icon_r = max(20, min(target_w, target_h) // 4)
-    cx, cy = target_w // 2, target_h // 2 - icon_r // 2
+    icon_r = max(20, min(cw, ch) // 4)
+    cx, cy = cx0 + cw // 2, cy0 + ch // 2 - icon_r // 2
     draw_weather_icon(draw, cx, cy, icon_r, entry["category"], palette_rgb)
 
     unit_suffix = "F" if units == "fahrenheit" else "C"
-    temp_size = max(24, min(target_w, target_h) // 3)
-    temp_font = ImageFont.load_default(size=temp_size)
+    temp_size = max(24, min(cw, ch) // 3)
+    temp_font = panel_style.font_bold(temp_size)
     temp_text = f"{round(entry['temp'])}°{unit_suffix}"
     bbox = draw.textbbox((0, 0), temp_text, font=temp_font)
     temp_y = cy + icon_r + 12
-    draw_text(img, (target_w // 2 - (bbox[2] - bbox[0]) // 2, temp_y), temp_text, temp_font)
+    draw_text(img, (cx0 + cw // 2 - (bbox[2] - bbox[0]) // 2, temp_y), temp_text, temp_font)
 
     if city_label:
         label_size = max(12, temp_size // 3)
-        label_font = ImageFont.load_default(size=label_size)
+        label_font = panel_style.font_regular(label_size)
         lbbox = draw.textbbox((0, 0), city_label, font=label_font)
-        draw_text(img, (target_w // 2 - (lbbox[2] - lbbox[0]) // 2, temp_y + temp_size + 8),
-                 city_label, label_font, MUTED)
+        draw_text(img, (cx0 + cw // 2 - (lbbox[2] - lbbox[0]) // 2, temp_y + temp_size + 8),
+                 city_label, label_font)
     return img
 
 
@@ -265,19 +271,23 @@ def build_hourly(entries: list[dict], target_w: int, target_h: int, palette_rgb:
     fetch_hourly), each showing an hour label, icon, and temp. Same
     "draw however many fit" graceful degradation as draw_weather_row if
     the box is too narrow for every tick."""
-    img = Image.new("RGB", (target_w, target_h), BG)
-    draw = ImageDraw.Draw(img)
-    text_x0 = MARGIN
-    text_w = target_w - MARGIN * 2
-    y = MARGIN
+    img, draw, (cx0, cy0, cw, ch) = panel_style.card_canvas(target_w, target_h)
+    text_x0 = cx0 + MARGIN
+    text_w = cw - MARGIN * 2
+    y = cy0 + MARGIN
 
-    title_size = max(14, min(target_w, target_h) // 16)
+    title_size = max(14, min(cw, ch) // 16)
     if city_label:
-        title_font = ImageFont.load_default(size=title_size)
-        draw_text(img, (text_x0, y), city_label, title_font)
-        y += title_size + 10
-        draw.line([(text_x0, y), (text_x0 + text_w, y)], fill=RULE)
-        y += 12
+        # A filled header bar (this widget's chosen accent is black, not
+        # a color, so the hand-drawn icons below stay the star -- see
+        # panel_style module docstring) replaces the old plain title +
+        # thin rule line.
+        header_h = title_size + 20
+        panel_style.draw_header_bar(draw, (cx0, cy0, cw, header_h), header_h,
+                                    panel_style.theme_color("weather", palette_rgb))
+        title_font = panel_style.font_bold(title_size)
+        draw_text(img, (text_x0, cy0 + (header_h - title_size) // 2), city_label, title_font, BG)
+        y = cy0 + header_h + 12
 
     # Capped to however many columns actually fit at a legible width
     # (narrower widgets/smaller intervals just show fewer ticks) rather
@@ -290,23 +300,24 @@ def build_hourly(entries: list[dict], target_w: int, target_h: int, palette_rgb:
     if not ticks:
         return img
     col_w = max(1, text_w // len(ticks))
-    icon_r = max(10, min(col_w // 3, (target_h - y - MARGIN) // 4))
+    icon_r = max(10, min(col_w // 3, (cy0 + ch - y - MARGIN) // 4))
     unit_suffix = "F" if units == "fahrenheit" else "C"
     time_labels = [_format_hour_label(e["time"]) for e in ticks]
     temp_labels = [f"{round(e['temp'])}°{unit_suffix}" for e in ticks]
     label_size = _fit_font_size(draw, time_labels + temp_labels, col_w - 6, max_size=icon_r)
-    label_font = ImageFont.load_default(size=label_size)
+    time_font = panel_style.font_regular(label_size)
+    temp_font = panel_style.font_bold(label_size)
 
     for i, entry in enumerate(ticks):
         cx = text_x0 + i * col_w + col_w // 2
         time_label = time_labels[i]
-        tbbox = draw.textbbox((0, 0), time_label, font=label_font)
-        draw_text(img, (cx - (tbbox[2] - tbbox[0]) // 2, y), time_label, label_font, MUTED)
+        tbbox = draw.textbbox((0, 0), time_label, font=time_font)
+        draw_text(img, (cx - (tbbox[2] - tbbox[0]) // 2, y), time_label, time_font)
         cy = y + label_size + 10 + icon_r
         draw_weather_icon(draw, cx, cy, icon_r, entry["category"], palette_rgb)
         temp_label = temp_labels[i]
-        tempbbox = draw.textbbox((0, 0), temp_label, font=label_font)
-        draw_text(img, (cx - (tempbbox[2] - tempbbox[0]) // 2, cy + icon_r + 6), temp_label, label_font)
+        tempbbox = draw.textbbox((0, 0), temp_label, font=temp_font)
+        draw_text(img, (cx - (tempbbox[2] - tempbbox[0]) // 2, cy + icon_r + 6), temp_label, temp_font)
     return img
 
 
@@ -317,40 +328,41 @@ def build_daily(daily: dict[str, dict], target_w: int, target_h: int, palette_rg
     configured day count by app/weather's provider fetch_daily -- this
     just draws whatever it's handed, same "stop once it doesn't fit"
     graceful degradation as draw_weather_row)."""
-    img = Image.new("RGB", (target_w, target_h), BG)
-    draw = ImageDraw.Draw(img)
-    text_x0 = MARGIN
-    text_w = target_w - MARGIN * 2
-    y = MARGIN
+    img, draw, (cx0, cy0, cw, ch) = panel_style.card_canvas(target_w, target_h)
+    text_x0 = cx0 + MARGIN
+    text_w = cw - MARGIN * 2
+    y = cy0 + MARGIN
 
-    title_size = max(14, min(target_w, target_h) // 16)
+    title_size = max(14, min(cw, ch) // 16)
     if city_label:
-        title_font = ImageFont.load_default(size=title_size)
-        draw_text(img, (text_x0, y), city_label, title_font)
-        y += title_size + 10
-        draw.line([(text_x0, y), (text_x0 + text_w, y)], fill=RULE)
-        y += 12
+        header_h = title_size + 20
+        panel_style.draw_header_bar(draw, (cx0, cy0, cw, header_h), header_h,
+                                    panel_style.theme_color("weather", palette_rgb))
+        title_font = panel_style.font_bold(title_size)
+        draw_text(img, (text_x0, cy0 + (header_h - title_size) // 2), city_label, title_font, BG)
+        y = cy0 + header_h + 12
 
     days = list(daily.items())
     if not days:
         return img
     col_w = max(1, text_w // len(days))
-    icon_r = max(12, min(col_w // 3, (target_h - y - MARGIN) // 4))
+    icon_r = max(12, min(col_w // 3, (cy0 + ch - y - MARGIN) // 4))
     unit_suffix = "F" if units == "fahrenheit" else "C"
     labels = [_day_label(date.fromisoformat(day_str)) for day_str, _ in days]
     temps_strs = [f"{round(d['high'])}°/{round(d['low'])}°{unit_suffix}" for _, d in days]
     label_size = _fit_font_size(draw, labels + temps_strs, col_w - 6, max_size=icon_r)
-    label_font = ImageFont.load_default(size=label_size)
+    label_font = panel_style.font_regular(label_size)
+    temp_font = panel_style.font_bold(label_size)
 
     for i, (_, d) in enumerate(days):
         x0 = text_x0 + i * col_w
         label, temps = labels[i], temps_strs[i]
         lbbox = draw.textbbox((0, 0), label, font=label_font)
-        draw_text(img, (x0 + col_w // 2 - (lbbox[2] - lbbox[0]) // 2, y), label, label_font, MUTED)
+        draw_text(img, (x0 + col_w // 2 - (lbbox[2] - lbbox[0]) // 2, y), label, label_font)
         cx, cy = x0 + col_w // 2, y + label_size + 10 + icon_r
         draw_weather_icon(draw, cx, cy, icon_r, d["category"], palette_rgb)
-        tbbox = draw.textbbox((0, 0), temps, font=label_font)
-        draw_text(img, (cx - (tbbox[2] - tbbox[0]) // 2, cy + icon_r + 8), temps, label_font)
+        tbbox = draw.textbbox((0, 0), temps, font=temp_font)
+        draw_text(img, (cx - (tbbox[2] - tbbox[0]) // 2, cy + icon_r + 8), temps, temp_font)
     return img
 
 
@@ -360,10 +372,9 @@ def build_multi_city(cities: list[dict], target_w: int, target_h: int, palette_r
     reuses draw_weather_row (the same layout calendar_render.py's
     embedded strip uses), just as the whole widget's own content instead
     of a strip above an agenda day."""
-    img = Image.new("RGB", (target_w, target_h), BG)
+    img, draw, (cx0, cy0, cw, ch) = panel_style.card_canvas(target_w, target_h)
     if not cities:
         return img
-    draw = ImageDraw.Draw(img)
     # Just the city name on-panel ("Portland", not the full disambiguated
     # "Portland, Oregon, United States") -- that fuller form matters for
     # telling apart geocoder candidates when adding a city (see
@@ -372,7 +383,7 @@ def build_multi_city(cities: list[dict], target_w: int, target_h: int, palette_r
     # calendar_render.py's _weather_for_day already does for its own
     # embedded strip.
     cities = [{**c, "label": c["label"].split(",")[0].strip()} for c in cities]
-    text_w = target_w - MARGIN * 2
+    text_w = cw - MARGIN * 2
     # Sized against how many entries actually need to fit side by side,
     # not just the box's height -- an icon/font picked from target_h
     # alone (as this used to do) drew each entry so wide that only the
@@ -380,13 +391,14 @@ def build_multi_city(cities: list[dict], target_w: int, target_h: int, palette_r
     # doesn't fit" degradation silently dropped every city after it,
     # even in an ordinary-sized widget with plenty of cities configured.
     col_w = max(1, text_w // len(cities))
-    icon_r = max(10, min(col_w // 6, target_h // 6, 40))
+    icon_r = max(10, min(col_w // 6, ch // 6, 40))
     unit_suffix = "F" if units == "fahrenheit" else "C"
     labels = [f"{c['label']} {round(c['high'])}°/{round(c['low'])}°{unit_suffix}" for c in cities]
-    font_size = _fit_font_size(draw, labels, col_w - (icon_r * 2 + 24), max_size=icon_r)
-    font = ImageFont.load_default(size=font_size)
-    y = max(MARGIN, (target_h - (icon_r * 2 + 8)) // 2)
-    draw_weather_row(img, draw, MARGIN, y, text_w, cities, icon_r=icon_r, font=font, units=units,
+    font_size = _fit_font_size(draw, labels, col_w - (icon_r * 2 + 24), max_size=icon_r,
+                               font_loader=panel_style.font_regular)
+    font = panel_style.font_regular(font_size)
+    y = max(cy0 + MARGIN, cy0 + (ch - (icon_r * 2 + 8)) // 2)
+    draw_weather_row(img, draw, cx0 + MARGIN, y, text_w, cities, icon_r=icon_r, font=font, units=units,
                      show_labels=True, palette_rgb=palette_rgb)
     return img
 

server/app/widgets/_shared.py

@@ -7,17 +7,19 @@ fraction of the panel, so its placeholder needs to scale down with it.
 
 from __future__ import annotations
 
-from PIL import Image, ImageDraw, ImageFont
+from PIL import Image, ImageDraw
 
-_BG = (245, 245, 245)
-_FG = (90, 90, 90)
+from .. import panel_style
+from ..image_pipeline import draw_text
+
+_BG = (255, 255, 255)
 
 
 def placeholder_image(target_w: int, target_h: int, lines: list[str]) -> Image.Image:
     img = Image.new("RGB", (target_w, target_h), _BG)
     draw = ImageDraw.Draw(img)
     font_size = max(10, min(20, target_h // 8))
-    font = ImageFont.load_default(size=font_size)
+    font = panel_style.font_regular(font_size)
     line_h = font_size + 4
     total_h = line_h * len(lines)
     y = max(4, (target_h - total_h) // 2)
@@ -25,6 +27,6 @@ def placeholder_image(target_w: int, target_h: int, lines: list[str]) -> Image.I
         bbox = draw.textbbox((0, 0), line, font=font)
         line_w = bbox[2] - bbox[0]
         x = max(4, (target_w - line_w) // 2)
-        draw.text((x, y), line, fill=_FG, font=font)
+        draw_text(img, (x, y), line, font)
         y += line_h
     return img

server/app/widgets/battery.py

@@ -17,10 +17,11 @@ from __future__ import annotations
 import io
 import time
 
-from PIL import Image, ImageDraw, ImageFont
+from PIL import Image, ImageDraw
 from sqlalchemy.orm import Session
 
-from ..image_pipeline import DEFAULT_PALETTE_RGB, _quantize, draw_text, logical_render_size
+from .. import panel_style
+from ..image_pipeline import _quantize, draw_text, logical_render_size
 from ..models import BatteryWidgetConfig, Frame, Widget
 from ..routers.common import battery_estimate_s
 from ._shared import placeholder_image
@@ -28,45 +29,16 @@ from ._shared import placeholder_image
 ACTIONS: dict = {}
 ACTION_LABELS: dict[str, str] = {}
 
-BG = (255, 255, 255)
-MUTED = (110, 110, 110)
 
-# Same thresholds/colors as manage_overlay.py's own battery glyph (not
-# shared code -- that one draws onto the manage-QR overlay in a fixed
-# small size, this one fills an arbitrary widget region -- but the
-# "how worried should I be" color story should read the same wherever a
-# battery glyph shows up on a panel). Exact panel ink RGB values, not
-# arbitrary reds/yellows/greens -- a flat fill already at a palette
-# color quantizes with zero dithering error once the whole composited
-# canvas gets quantized, where an off-palette color would dither into a
-# visible speckle at these small on-panel sizes.
-_LOW = DEFAULT_PALETTE_RGB[3]  # red
-_MEDIUM = DEFAULT_PALETTE_RGB[2]  # yellow
-_HIGH = DEFAULT_PALETTE_RGB[5]  # green
-
-
-def _fill_color(percent: int) -> tuple[int, int, int]:
-    if percent <= 15:
-        return _LOW
-    if percent <= 40:
-        return _MEDIUM
-    return _HIGH
-
-
-def _draw_icon(draw: ImageDraw.ImageDraw, cx: int, top: int, icon_w: int, icon_h: int, percent: int) -> None:
-    stroke = max(2, icon_h // 12)
+def _draw_icon(draw: ImageDraw.ImageDraw, cx: int, top: int, icon_w: int, icon_h: int, percent: int,
+              palette_rgb: list | None = None) -> None:
+    """Centers panel_style.draw_battery_icon (top-left-anchored) under
+    `cx` -- this widget's own layout picks a center point, that helper's
+    shared implementation (also used by manage_overlay.py's battery
+    readout) just needs a top-left corner."""
     nub_w = max(3, icon_w // 10)
-    nub_h = icon_h // 2
     x0 = cx - (icon_w + nub_w) // 2
-    y0 = top
-    inner_x0, inner_y0 = x0 + stroke, y0 + stroke
-    inner_x1, inner_y1 = x0 + icon_w - stroke, y0 + icon_h - stroke
-    fill_x1 = inner_x0 + round((inner_x1 - inner_x0) * (max(0, min(100, percent)) / 100))
-    if fill_x1 > inner_x0:
-        draw.rectangle([inner_x0, inner_y0, fill_x1, inner_y1], fill=_fill_color(percent))
-    draw.rectangle([x0, y0, x0 + icon_w, y0 + icon_h], outline=(0, 0, 0), width=stroke)
-    nub_y = y0 + (icon_h - nub_h) // 2
-    draw.rectangle([x0 + icon_w, nub_y, x0 + icon_w + nub_w, nub_y + nub_h], fill=(0, 0, 0))
+    panel_style.draw_battery_icon(draw, x0, top, icon_w, icon_h, percent, palette_rgb)
 
 
 def _format_estimate(seconds: float) -> str:
@@ -88,6 +60,21 @@ def _format_age(as_of: float) -> str:
     return f"{round(delta / 86400)}d ago"
 
 
+def _lines_for(mode: str, frame: Frame, db: Session) -> list[str]:
+    """The 0-2 caption lines "detailed" mode shows below the percent --
+    shared by both render styles so the estimate/age formatting only
+    lives in one place."""
+    if mode != "detailed":
+        return []
+    lines = []
+    estimate_s = battery_estimate_s(frame, db)
+    if estimate_s is not None:
+        lines.append(_format_estimate(estimate_s))
+    if frame.battery_as_of:
+        lines.append(f"Reported {_format_age(frame.battery_as_of)}")
+    return lines
+
+
 def render(db: Session, frame: Frame, widget: Widget, target_w: int, target_h: int,
           is_normal_wake: bool = True) -> Image.Image:
     """is_normal_wake is unused -- see app/widgets/whiteboard.py's
@@ -99,40 +86,46 @@ def render(db: Session, frame: Frame, widget: Widget, target_w: int, target_h: i
 
     cfg = db.get(BatteryWidgetConfig, widget.id)
     mode = cfg.mode if cfg else "detailed"
+    palette_rgb = frame.palette_rgb
+    lines = _lines_for(mode, frame, db)
 
-    img = Image.new("RGB", (target_w, target_h), BG)
-    draw = ImageDraw.Draw(img)
-    cx = target_w // 2
+    if cfg and cfg.render_style == "modern":
+        # Local import: html_render pulls in Playwright, a real headless-
+        # Chromium dependency -- every other widget type, and this one's
+        # own classic path, should never pay for it (same reasoning as
+        # image_pipeline.render_placeholder's local `import qrcode`).
+        from .. import html_render
 
-    icon_h = max(20, min(target_w, target_h) // 3)
+        return html_render.build_battery(percent, lines, target_w, target_h, palette_rgb, frame.theme)
+
+    img, draw, (cx0, cy0, cw, ch) = panel_style.card_canvas(target_w, target_h)
+    cx = cx0 + cw // 2
+
+    icon_h = max(20, min(cw, ch) // 3)
     icon_w = int(icon_h * 1.8)
-    icon_top = max(4, target_h // 8)
-    _draw_icon(draw, cx, icon_top, icon_w, icon_h, percent)
+    icon_top = max(4, cy0 + ch // 8)
+    _draw_icon(draw, cx, icon_top, icon_w, icon_h, percent, palette_rgb)
 
-    pct_font_size = max(18, min(target_w, target_h) // 3)
-    pct_font = ImageFont.load_default(size=pct_font_size)
+    # The percent number picks up the icon's own charge-level color
+    # (red/yellow/green) instead of plain black -- ties the two into one
+    # visual statement rather than "colored icon, black number".
+    pct_font_size = max(18, min(cw, ch) // 3)
+    pct_font = panel_style.font_bold(pct_font_size)
     pct_text = f"{percent}%"
     bbox = draw.textbbox((0, 0), pct_text, font=pct_font)
     pct_y = icon_top + icon_h + 10
-    draw_text(img, (cx - (bbox[2] - bbox[0]) // 2, pct_y), pct_text, pct_font)
+    draw_text(img, (cx - (bbox[2] - bbox[0]) // 2, pct_y), pct_text, pct_font,
+             panel_style.battery_fill_color(percent, palette_rgb))
 
-    if mode == "detailed":
-        lines = []
-        estimate_s = battery_estimate_s(frame, db)
-        if estimate_s is not None:
-            lines.append(_format_estimate(estimate_s))
-        if frame.battery_as_of:
-            lines.append(f"Reported {_format_age(frame.battery_as_of)}")
-
-        small_font_size = max(11, pct_font_size // 3)
-        small_font = ImageFont.load_default(size=small_font_size)
-        y = pct_y + pct_font_size + 12
-        for line in lines:
-            if y + small_font_size > target_h - 4:
-                break
-            lbbox = draw.textbbox((0, 0), line, font=small_font)
-            draw_text(img, (cx - (lbbox[2] - lbbox[0]) // 2, y), line, small_font, MUTED)
-            y += small_font_size + 6
+    small_font_size = max(11, pct_font_size // 3)
+    small_font = panel_style.font_regular(small_font_size)
+    y = pct_y + pct_font_size + 12
+    for line in lines:
+        if y + small_font_size > cy0 + ch - 4:
+            break
+        lbbox = draw.textbbox((0, 0), line, font=small_font)
+        draw_text(img, (cx - (lbbox[2] - lbbox[0]) // 2, y), line, small_font)
+        y += small_font_size + 6
 
     return img
 

server/app/widgets/calendar.py

@@ -19,6 +19,8 @@ from __future__ import annotations
 from PIL import Image
 from sqlalchemy.orm import Session
 
+from zoneinfo import ZoneInfo
+
 from ..calendar_render import _build
 from ..db import widget_locked
 from ..models import CalendarWidgetConfig, Frame, Widget
@@ -47,6 +49,19 @@ def render(db: Session, frame: Frame, widget: Widget, target_w: int, target_h: i
     events, fetch_summary = get_or_refresh_calendar_events_for_widget(db, frame, widget)
     weather_cities = get_or_refresh_weather_for_widget(db, frame, widget) if cfg.weather_enabled else None
 
+    if cfg.render_style == "modern":
+        # Local import: html_render pulls in Playwright, a real headless-
+        # Chromium dependency -- every other widget type, and this one's
+        # own classic path, should never pay for it.
+        from .. import calendar_html_render
+
+        tz = ZoneInfo(frame.timezone) if frame.timezone else ZoneInfo("UTC")
+        return calendar_html_render.build(
+            events, cfg.view, cfg.browse_offset, target_w, target_h, tz, cfg.week_start, frame.palette_rgb,
+            weather_cities, cfg.weather_units, cfg.week_days, cfg.week_layout, cfg.week_start_offset,
+            frame.theme,
+        )
+
     return _build(
         events, view=cfg.view, browse_offset=cfg.browse_offset, target_w=target_w, target_h=target_h,
         timezone=frame.timezone, fetch_summary=fetch_summary, week_start=cfg.week_start,

server/app/widgets/photos.py

@@ -8,7 +8,23 @@ take down the whole panel's render just because one region out of
 several couldn't be composed this cycle; it falls back to a small
 placeholder instead, the same resilience calendar mode's old photo-inlay
 already had (see routers/device.py's `except HTTPException: pass` around
-its own inlay fetch)."""
+its own inlay fetch).
+
+Unlike every other widget type, render() quantizes its own output
+(against Frame.photo_palette_rgb/photo_dither_strength, not the main
+palette_rgb/dither_strength the rest of the frame uses) before
+returning, so a frame can tune its other widgets' look (e.g. the
+"modern" HTML-rendered widgets' Bayer dithering) independently of
+whatever looks best for actual photographs -- see image_pipeline.
+render_panel's docstring for why this is safe to do per-widget without
+a shared-canvas seam risk. One small, accepted edge case: widget
+borders are always drawn afterward (routers/device.py's
+_render_one_widget) against the *main* palette_rgb, so a border on a
+photos widget whose photo_palette_rgb genuinely diverges from
+palette_rgb can sit against already-quantized-to-a-different-reference
+photo pixels -- cosmetically arguable, not a bug, and not worth
+special-casing border resolution for what's a deliberate, uncommon
+customization."""
 
 from __future__ import annotations
 
@@ -18,7 +34,7 @@ from sqlalchemy.orm import Session
 
 from .. import photo_queue, quiet_hours
 from ..db import widget_locked
-from ..image_pipeline import compose_into
+from ..image_pipeline import _quantize, compose_into
 from ..models import Frame, PhotoWidgetConfig, Widget
 from ..routers.common import fetch_source_and_faces, immich_client_for, list_assets
 from ._shared import placeholder_image
@@ -50,7 +66,8 @@ def render(db: Session, frame: Frame, widget: Widget, target_w: int, target_h: i
     except HTTPException as e:
         return placeholder_image(target_w, target_h, ["Photos widget", str(e.detail)[:40]])
 
-    return compose_into(source, faces, target_w, target_h, cfg.display_mode)
+    composed = compose_into(source, faces, target_w, target_h, cfg.display_mode)
+    return _quantize(composed, frame.photo_palette_rgb, frame.photo_dither_strength).convert("RGB")
 
 
 def _advance(db: Session, frame: Frame, widget: Widget) -> None:

server/app/widgets/static_image.py

@@ -32,4 +32,12 @@ def render(db: Session, frame: Frame, widget: Widget, target_w: int, target_h: i
     if not cfg.image:
         return placeholder_image(target_w, target_h, ["Static image widget", "not configured yet"])
     source = Image.open(io.BytesIO(cfg.image)).convert("RGB")
-    return compose_into(source, faces=None, target_w=target_w, target_h=target_h, display_mode=cfg.display_mode)
+    composed = compose_into(source, faces=None, target_w=target_w, target_h=target_h, display_mode=cfg.display_mode)
+    if cfg.render_style == "modern":
+        # Local import: html_render pulls in Playwright, a real headless-
+        # Chromium dependency -- every other widget type, and this one's
+        # own classic path, should never pay for it.
+        from .. import html_render
+
+        return html_render.build_framed_image(composed, target_w, target_h, frame.palette_rgb, frame.theme, "static")
+    return composed

server/app/widgets/tasks.py

@@ -36,7 +36,15 @@ def render(db: Session, frame: Frame, widget: Widget, target_w: int, target_h: i
     signature regardless of which ones actually care."""
     tasks = get_or_refresh_tasks_for_widget(db, frame, widget)
     cfg = db.get(TaskWidgetConfig, widget.id)
-    return _build_tasks(tasks, target_w, target_h, frame.palette_rgb, cfg.name or "Tasks")
+    title = cfg.name or "Tasks"
+    if cfg.render_style == "modern":
+        # Local import: html_render pulls in Playwright, a real headless-
+        # Chromium dependency -- every other widget type, and this one's
+        # own classic path, should never pay for it.
+        from .. import html_render
+
+        return html_render.build_tasks(tasks, target_w, target_h, frame.palette_rgb, title, frame.theme)
+    return _build_tasks(tasks, target_w, target_h, frame.palette_rgb, title)
 
 
 ACTIONS: dict = {}

server/app/widgets/text.py

@@ -20,12 +20,11 @@ block of authored text."""
 from __future__ import annotations
 
 import re
-from functools import lru_cache
-from pathlib import Path
 
-from PIL import Image, ImageDraw, ImageFont
+from PIL import Image, ImageDraw
 from sqlalchemy.orm import Session
 
+from .. import theme_tokens
 from ..image_pipeline import _quantize, draw_text, hex_to_rgb, logical_render_size
 from ..models import Frame, TextWidgetConfig, Widget
 from ..text_content import has_text
@@ -40,66 +39,20 @@ LINE_HEIGHT_FACTOR = 1.35
 DEFAULT_FG = (0, 0, 0)
 DEFAULT_BG = (255, 255, 255)
 
-_FONT_DIR = Path(__file__).resolve().parent.parent / "fonts"
-
-# A small curated set, not an open-ended picker -- each entry needs a
-# real vendored Regular/Bold/Italic/BoldItalic file, so families that
-# only ship as a variable font (Playfair Display, Lora, Merriweather,
-# stock "Inter"/"Source Sans 3" from Google Fonts) were skipped in favor
-# of static builds from their own upstream repos where one exists (see
-# app/fonts/OFL-*.txt for each non-Noto family's own license/copyright --
-# they're all OFL, same as the Noto fonts already vendored here, but
-# each has a different copyright holder so gets its own license file
-# rather than sharing app/fonts/OFL.txt).
-DEFAULT_FONT_FAMILY = "sans"
-FONT_FAMILIES: dict[str, str] = {
-    "sans": "Sans-serif (Noto Sans)",
-    "inter": "Inter",
-    "source_sans": "Source Sans",
-    "serif": "Serif (Noto Serif)",
-    "elegant": "Elegant serif (Crimson Text)",
-    "slab": "Slab serif (Arvo)",
-    "mono": "Monospace (IBM Plex Mono)",
-}
-_FONT_FILES = {
-    "sans": {
-        (False, False): "NotoSans-Regular.ttf", (True, False): "NotoSans-Bold.ttf",
-        (False, True): "NotoSans-Italic.ttf", (True, True): "NotoSans-BoldItalic.ttf",
-    },
-    "inter": {
-        (False, False): "Inter-Regular.ttf", (True, False): "Inter-Bold.ttf",
-        (False, True): "Inter-Italic.ttf", (True, True): "Inter-BoldItalic.ttf",
-    },
-    "source_sans": {
-        (False, False): "SourceSans3-Regular.ttf", (True, False): "SourceSans3-Bold.ttf",
-        (False, True): "SourceSans3-Italic.ttf", (True, True): "SourceSans3-BoldItalic.ttf",
-    },
-    "serif": {
-        (False, False): "NotoSerif-Regular.ttf", (True, False): "NotoSerif-Bold.ttf",
-        (False, True): "NotoSerif-Italic.ttf", (True, True): "NotoSerif-BoldItalic.ttf",
-    },
-    "elegant": {
-        (False, False): "CrimsonText-Regular.ttf", (True, False): "CrimsonText-Bold.ttf",
-        (False, True): "CrimsonText-Italic.ttf", (True, True): "CrimsonText-BoldItalic.ttf",
-    },
-    "slab": {
-        (False, False): "Arvo-Regular.ttf", (True, False): "Arvo-Bold.ttf",
-        (False, True): "Arvo-Italic.ttf", (True, True): "Arvo-BoldItalic.ttf",
-    },
-    "mono": {
-        (False, False): "IBMPlexMono-Regular.ttf", (True, False): "IBMPlexMono-Bold.ttf",
-        (False, True): "IBMPlexMono-Italic.ttf", (True, True): "IBMPlexMono-BoldItalic.ttf",
-    },
-}
+# The font-family table (a small curated set, not an open-ended picker --
+# each entry needs a real vendored Regular/Bold/Italic/BoldItalic file)
+# lives in app/theme_tokens.py now, shared with every modern-style
+# widget's own font resolution -- re-exported here under their original
+# names since this was the text widget's own table before the theme
+# system needed it too (see app/fonts/OFL-*.txt for each non-Noto
+# family's own license/copyright).
+DEFAULT_FONT_FAMILY = theme_tokens.DEFAULT_FONT_FAMILY
+FONT_FAMILIES = theme_tokens.FONT_FAMILIES
+_FONT_FILES = theme_tokens._FONT_FILES
+_font = theme_tokens.font
 _WORD_OR_SPACE = re.compile(r"\S+|\s+")
 
 
-@lru_cache(maxsize=256)
-def _font(family: str, bold: bool, italic: bool, size: int) -> ImageFont.FreeTypeFont:
-    files = _FONT_FILES.get(family) or _FONT_FILES[DEFAULT_FONT_FAMILY]
-    return ImageFont.truetype(str(_FONT_DIR / files[(bold, italic)]), size)
-
-
 def _paragraph_word_groups(paragraph: list[dict]) -> list[list[dict]]:
     """One paragraph's styled runs -> word groups: each group is a list
     of same-word sub-tokens that must stay glued together on one line
@@ -224,6 +177,29 @@ def _render_text(cfg: TextWidgetConfig, target_w: int, target_h: int) -> Image.I
     return img
 
 
+def _render_dispatch(cfg: TextWidgetConfig, target_w: int, target_h: int,
+                     palette_rgb: list | None, theme_name: str | None = None) -> Image.Image:
+    """classic vs modern (app/html_render.py) -- shared by render() and
+    render_preview_png() so both honor render_style identically (weather
+    once shipped with its preview endpoint bypassing render_style
+    entirely by calling the classic renderer directly -- this shared
+    dispatch point exists specifically so that bug can't happen here).
+    palette_rgb is unused by the classic path (it never quantizes itself
+    -- see module docstring), only threaded through for modern's own
+    ordered_dither. theme_name is threaded through uniformly (every
+    modern-style widget's dispatch takes one) but build_text ignores it
+    -- see its own docstring for why (the text widget's font is a
+    per-widget, user-authored choice, not theme-driven)."""
+    if cfg.render_style == "modern":
+        # Local import: html_render pulls in Playwright, a real headless-
+        # Chromium dependency -- every other widget type, and this one's
+        # own classic path, should never pay for it.
+        from .. import html_render
+
+        return html_render.build_text(cfg, target_w, target_h, palette_rgb, theme_name)
+    return _render_text(cfg, target_w, target_h)
+
+
 def render(db: Session, frame: Frame, widget: Widget, target_w: int, target_h: int,
           is_normal_wake: bool = True) -> Image.Image:
     """is_normal_wake is unused -- see app/widgets/whiteboard.py's
@@ -232,10 +208,11 @@ def render(db: Session, frame: Frame, widget: Widget, target_w: int, target_h: i
     cfg = db.get(TextWidgetConfig, widget.id)
     if cfg is None or not has_text(cfg.content):
         return placeholder_image(target_w, target_h, ["Text widget", "not configured yet"])
-    return _render_text(cfg, target_w, target_h)
+    return _render_dispatch(cfg, target_w, target_h, frame.palette_rgb, frame.theme)
 
 
-def render_preview_png(cfg: TextWidgetConfig, orientation: str, palette_rgb: list | None) -> bytes:
+def render_preview_png(cfg: TextWidgetConfig, orientation: str, palette_rgb: list | None,
+                       theme_name: str | None = None) -> bytes:
     """A normal browser-viewable PNG at full logical panel size --
     mirrors calendar_render.render_tasks_preview_png's relationship to
     render_tasks (the dialog's own preview endpoint always renders at
@@ -244,7 +221,7 @@ def render_preview_png(cfg: TextWidgetConfig, orientation: str, palette_rgb: lis
     import io
 
     target_w, target_h = logical_render_size(orientation)
-    img = _render_text(cfg, target_w, target_h)
+    img = _render_dispatch(cfg, target_w, target_h, palette_rgb, theme_name)
     quantized = _quantize(img, palette_rgb, dither_strength=1.0)
     buf = io.BytesIO()
     quantized.convert("RGB").save(buf, format="PNG")

server/app/widgets/weather.py

@@ -1,9 +1,12 @@
 """Weather widget: one of four display modes (see models.
 WeatherWidgetConfig) backed by a pluggable provider (app/weather/'s
 PROVIDERS registry -- Open-Meteo or NWS) and drawn by app/weather_render.
-py's build() dispatch. No real "next"/"back" concept (same as
-whiteboard) -- a single "check now" action forces a re-fetch bypassing
-the normal throttle."""
+py's build() dispatch -- or, for "current"/"daily" modes with
+render_style="modern", by app/html_render.py's Jinja2/headless-Chromium
+renderer instead (experimental; hourly/multi_city always render classic
+regardless of render_style, see html_render's module docstring). No real
+"next"/"back" concept (same as whiteboard) -- a single "check now"
+action forces a re-fetch bypassing the normal throttle."""
 
 from __future__ import annotations
 
@@ -27,6 +30,18 @@ def render(db: Session, frame: Frame, widget: Widget, target_w: int, target_h: i
     data = get_or_refresh_weather_widget_data(db, frame, widget)
     if data is None:
         return placeholder_image(target_w, target_h, ["Weather widget", "not configured yet"])
+
+    if cfg.render_style == "modern" and cfg.mode in ("current", "daily"):
+        # Local import: html_render pulls in Playwright, a real headless-
+        # Chromium dependency -- every other widget type, and this one's
+        # own classic/hourly/multi_city paths, should never pay for it
+        # (same reasoning as image_pipeline.render_placeholder's local
+        # `import qrcode`).
+        from .. import html_render
+
+        return html_render.build(cfg.mode, data, target_w, target_h, frame.palette_rgb, cfg.units,
+                                 city_label=cfg.city_label or "", theme_name=frame.theme)
+
     return weather_render.build(
         cfg.mode, data, target_w, target_h, frame.palette_rgb, cfg.units,
         city_label=cfg.city_label or "", interval_hours=cfg.hourly_interval_hours,

server/app/widgets/whiteboard.py

@@ -15,7 +15,7 @@ from PIL import Image
 from sqlalchemy.orm import Session
 
 from ..image_pipeline import compose_into
-from ..models import Frame, Widget
+from ..models import Frame, Widget, WhiteboardWidgetConfig
 from ..routers.common import get_or_refresh_whiteboard_for_widget
 from ._shared import placeholder_image
 
@@ -35,7 +35,17 @@ def render(db: Session, frame: Frame, widget: Widget, target_w: int, target_h: i
     # letterbox, never cropped: unlike a photo, losing part of a
     # whiteboard to a crop loses actual content, not just some background
     # (see the old _render_whiteboard_mode's identical reasoning).
-    return compose_into(source, faces=None, target_w=target_w, target_h=target_h, display_mode="letterbox")
+    composed = compose_into(source, faces=None, target_w=target_w, target_h=target_h, display_mode="letterbox")
+    cfg = db.get(WhiteboardWidgetConfig, widget.id)
+    if cfg and cfg.render_style == "modern":
+        # Local import: html_render pulls in Playwright, a real headless-
+        # Chromium dependency -- every other widget type, and this one's
+        # own classic path, should never pay for it.
+        from .. import html_render
+
+        return html_render.build_framed_image(composed, target_w, target_h, frame.palette_rgb, frame.theme,
+                                              "whiteboard")
+    return composed
 
 
 def _check_now(db: Session, frame: Frame, widget: Widget) -> None:

server/requirements.txt

@@ -11,3 +11,5 @@ icalendar==7.2.2
 recurring-ical-events==3.8.2
 caldav==3.2.1
 pypdfium2==5.12.1
+playwright==1.61.0
+numpy==2.5.1

server/start.sh

@@ -5,6 +5,18 @@
 # Then execs uvicorn as the foreground/PID 1 process so it receives
 # Docker's stop signal directly.
 #
+# Before either: fetch headless Chromium (app/html_render.py, the
+# weather widget's opt-in "modern" render style) into
+# PLAYWRIGHT_BROWSERS_PATH (set in the Dockerfile to a path on the /data
+# volume) if it isn't already cached there -- see the Dockerfile's own
+# comment for why this happens at startup instead of build time. Only
+# the very first boot on a fresh volume actually downloads anything;
+# every boot after that is a no-op ls check.
+if [ -z "$(ls -A "$PLAYWRIGHT_BROWSERS_PATH" 2>/dev/null)" ]; then
+  echo "Fetching headless Chromium into $PLAYWRIGHT_BROWSERS_PATH (first boot on this volume)..." >&2
+  playwright install chromium-headless-shell
+fi
+#
 # Wrapped in a restart loop, not a bare `node ... &`: a bare background
 # process that crashes stays dead for good, with nothing to bring it
 # back -- turning any single render crash (a not-yet-found jsdom/

server/tests/conftest.py

@@ -29,6 +29,10 @@ from pathlib import Path
 
 _tmp_dir = tempfile.mkdtemp(prefix="espresso_frame_tests_")
 os.environ["DATABASE_URL"] = f"sqlite:///{Path(_tmp_dir) / 'test.db'}"
+# Same reasoning as DATABASE_URL above: logging_setup.configure_logging()
+# also runs as an app.main import-time side effect and would otherwise
+# try to create the real /data directory.
+os.environ["LOG_PATH"] = str(Path(_tmp_dir) / "server.log")
 
 import pytest
 from fastapi.testclient import TestClient

server/tests/test_admin_logs.py

@@ -0,0 +1,75 @@
+"""Permission boundary + basic content checks for the admin log viewer
+(routers/pages.py's admin_logs_page/admin_logs_download) -- see
+CLAUDE.md's note that anything gated by an admin/permission check needs
+a same-shape test: admin, non-admin logged in, logged out."""
+
+from __future__ import annotations
+
+import logging
+
+from app.logging_setup import LOG_PATH
+from app.models import Frame
+
+from .conftest import login, make_user
+
+
+def _setup_admin_and_user(client, db_session) -> None:
+    client.post("/setup", data={"username": "alice", "password": "hunter22"})
+    make_user(db_session, "bob")
+
+
+def test_admin_can_view_logs(client, db_session):
+    _setup_admin_and_user(client, db_session)
+    login(client, "alice", "hunter22")
+    logging.getLogger("app.test").info("marker-line-for-test")
+    resp = client.get("/admin/logs")
+    assert resp.status_code == 200
+    assert "marker-line-for-test" in resp.text
+
+
+def test_non_admin_forbidden_from_logs(client, db_session):
+    _setup_admin_and_user(client, db_session)
+    login(client, "bob")
+    resp = client.get("/admin/logs")
+    assert resp.status_code == 403
+    resp = client.get("/admin/logs/download")
+    assert resp.status_code == 403
+
+
+def test_logged_out_redirected_from_logs_page(client, db_session):
+    _setup_admin_and_user(client, db_session)
+    client.cookies.clear()  # /setup itself logs alice in
+    resp = client.get("/admin/logs")
+    assert resp.status_code == 303
+    assert resp.headers["location"] == "/login"
+
+
+def test_admin_can_download_log_file(client, db_session):
+    _setup_admin_and_user(client, db_session)
+    login(client, "alice", "hunter22")
+    logging.getLogger("app.test").info("marker-line-for-download")
+    resp = client.get("/admin/logs/download")
+    assert resp.status_code == 200
+    assert b"marker-line-for-download" in resp.content
+
+
+def test_device_requests_are_logged(client, db_session):
+    _setup_admin_and_user(client, db_session)
+    frame = db_session.get(Frame, 1)
+    frame.device_id = "aabbccddeeff"
+    db_session.commit()
+    resp = client.get(f"/frame/config?id={frame.device_id}&token={frame.device_token}")
+    assert resp.status_code == 200
+
+    login(client, "alice", "hunter22")
+    log_resp = client.get("/admin/logs")
+    # Jinja HTML-escapes the rendered <pre>, so "->" becomes "-&gt;".
+    assert f"GET /frame/config id={frame.device_id} -&gt; 200" in log_resp.text
+
+
+def test_download_404s_before_any_log_written(client, db_session, monkeypatch):
+    _setup_admin_and_user(client, db_session)
+    login(client, "alice", "hunter22")
+    monkeypatch.setattr("app.routers.pages.LOG_PATH", LOG_PATH.parent / "does-not-exist.log")
+    resp = client.get("/admin/logs/download")
+    assert resp.status_code == 404

server/tests/test_battery_estimate.py

@@ -1,11 +1,10 @@
-"""_reject_outlier_drops -- the outlier-rejection pass in the battery
-remaining-time estimate (see routers/common.py's battery_estimate_s).
-Pure function, no DB/HTTP -- (recency_weight, drop_pct) pairs in,
-filtered pairs out."""
+"""_reject_outlier_drops and _smooth_percents -- the two outlier-rejection
+passes in the battery remaining-time estimate (see routers/common.py's
+battery_estimate_s). Pure functions, no DB/HTTP."""
 
 from __future__ import annotations
 
-from app.routers.common import _reject_outlier_drops
+from app.routers.common import _reject_outlier_drops, _smooth_percents
 
 
 def _steps(drops: list[float]) -> list[tuple[int, float]]:
@@ -69,3 +68,37 @@ def test_never_filters_down_to_nothing():
     steps = _steps([1, 1, 1, 1, 10, 10, 10, 10])
     kept = _reject_outlier_drops(steps)
     assert len(kept) > 0
+
+
+def test_smooth_corrects_isolated_spike():
+    percents = [70, 70, 70, 70, 70, 90, 70, 70, 70, 70, 70]
+    smoothed = _smooth_percents(percents)
+    assert smoothed[5] == 70
+    assert smoothed[:5] == percents[:5]
+    assert smoothed[6:] == percents[6:]
+
+
+def test_smooth_corrects_short_burst():
+    """The shape seen in production: several consecutive corrupted
+    reports (a 1M-ohm divider glitching for a few reports in a row, not
+    just one) spliced into an otherwise flat run. A step computed
+    between two of these looks like an ordinary small change, which is
+    exactly why _reject_outlier_drops alone can't catch this shape."""
+    percents = [53, 53, 53, 53, 41, 40, 40, 42, 53, 53, 53, 53]
+    smoothed = _smooth_percents(percents)
+    assert smoothed[4:8] == [53, 53, 53, 53]
+    assert smoothed[:4] == percents[:4]
+    assert smoothed[8:] == percents[8:]
+
+
+def test_smooth_leaves_gradual_legitimate_trend_alone():
+    """A slow, steady climb (recharge) or decline spread over many
+    reports is a real trend, not a local glitch -- each reading is close
+    to its own neighborhood's median, so nothing should be flagged."""
+    percents = list(range(80, 60, -2))  # 80, 78, 76, ... steady discharge
+    assert _smooth_percents(percents) == percents
+
+
+def test_smooth_identical_readings_untouched():
+    percents = [50] * 12
+    assert _smooth_percents(percents) == percents

server/tests/test_device_widget_dispatch.py

@@ -144,3 +144,50 @@ def test_two_widget_frame_composites_both_and_next_targets_calendar(client, db_s
     photo_cfg = db_session.get(PhotoWidgetConfig, photo_widget.id)
     assert cal_cfg.browse_offset == 1
     assert photo_cfg.current_asset_id == ""  # untouched -- NEXT was never bound to it
+
+
+def test_widgets_render_concurrently(client, db_session, monkeypatch):
+    """Two independent, slow widgets on one frame should render in
+    roughly the time of the slowest one, not the sum -- the actual fix
+    for the "hold to cycle layouts times out and shows a false server-
+    failed status screen" bug: several network-backed widgets (photos,
+    weather, calendar) rendering one after another could push a single
+    /frame/* response past the firmware's fixed HTTP timeout even though
+    the server was simply still working."""
+    monkeypatch.setattr(widgets.photos, "immich_client_for", lambda frame: object())
+    monkeypatch.setattr(widgets.photos, "list_assets", lambda client, album_id: _ASSETS)
+
+    from PIL import Image
+    source = Image.new("RGB", (100, 80), (10, 20, 30))
+
+    def _slow_fetch(client, mode, asset_id):
+        time.sleep(0.25)
+        return source, None
+
+    monkeypatch.setattr(widgets.photos, "fetch_source_and_faces", _slow_fetch)
+
+    frame = Frame(
+        name="Concurrency Frame", device_id="112233445566", device_token="devtok-3",
+        manage_token="mtok-3", orientation="landscape", created_at=time.time(),
+    )
+    db_session.add(frame)
+    db_session.flush()
+
+    widget_a = Widget(frame_id=frame.id, widget_type="photos", x=0, y=0, w=4, h=5,
+                      sort_order=0, created_at=time.time())
+    widget_b = Widget(frame_id=frame.id, widget_type="photos", x=4, y=0, w=4, h=5,
+                      sort_order=1, created_at=time.time())
+    db_session.add_all([widget_a, widget_b])
+    db_session.flush()
+    db_session.add(PhotoWidgetConfig(widget_id=widget_a.id, album_id="album-a"))
+    db_session.add(PhotoWidgetConfig(widget_id=widget_b.id, album_id="album-b"))
+    db_session.commit()
+
+    start = time.monotonic()
+    resp = client.get(f"/frame/image?id={frame.device_id}&token={frame.device_token}")
+    elapsed = time.monotonic() - start
+
+    assert resp.status_code == 200
+    assert len(resp.content) == EXPECTED_BYTES
+    # Serial would be ~0.5s (2 x 0.25s); concurrent should land near 0.25s.
+    assert elapsed < 0.45, f"widgets rendered serially, not concurrently ({elapsed:.2f}s)"

server/tests/test_firmware_check.py

@@ -0,0 +1,89 @@
+"""POST /api/frames/{id}/firmware/check -- the "Check now" button's
+endpoint. update_available compares the latest Gitea release against
+what's *staged* (firmware_available_version), not what the device is
+actually running (device_firmware_version) -- those can differ once a
+release has been staged/auto-applied but the frame hasn't woken up and
+picked it up yet. running_version lets the UI tell "up to date" apart
+from "staged, waiting for the frame to apply it" instead of collapsing
+both into the same message."""
+
+from __future__ import annotations
+
+from app import gitea_releases
+from app.models import Frame
+
+from .conftest import csrf_headers
+
+
+def _setup_frame(db_session, monkeypatch, latest_version, **overrides):
+    """firmware_update_checked_at starts at 0, so the endpoint always
+    tries a real Gitea fetch on a fresh frame regardless of force= --
+    stub it out rather than hitting the network."""
+    monkeypatch.setattr(
+        gitea_releases, "fetch_latest_release", lambda *a, **k: {"version": latest_version, "assets": {}}
+    )
+    frame = db_session.get(Frame, 1)
+    frame.firmware_update_repo_url = "https://git.example.com/owner/repo"
+    frame.device_board_variant = "devkit"
+    for key, value in overrides.items():
+        setattr(frame, key, value)
+    db_session.commit()
+    return frame
+
+
+def test_up_to_date_when_running_matches_latest(client, db_session, monkeypatch):
+    client.post("/setup", data={"username": "alice", "password": "hunter22"})
+    _setup_frame(
+        db_session,
+        monkeypatch,
+        "1.4.1",
+        firmware_available_version="1.4.1",
+        device_firmware_version="1.4.1",
+    )
+
+    resp = client.post("/api/frames/1/firmware/check", headers=csrf_headers(client))
+    assert resp.status_code == 200
+    data = resp.json()
+    assert data["update_available"] is False
+    assert data["latest_version"] == "1.4.1"
+    assert data["running_version"] == "1.4.1"
+
+
+def test_staged_but_not_yet_running_is_not_update_available(client, db_session, monkeypatch):
+    """A release already staged (e.g. by a previous auto-update) but not
+    yet applied by the device isn't "an update is available" -- there's
+    nothing left to fetch/stage -- but it also isn't silently "up to
+    date" from the UI's perspective, since running_version still lags."""
+    client.post("/setup", data={"username": "alice", "password": "hunter22"})
+    _setup_frame(
+        db_session,
+        monkeypatch,
+        "1.4.1",
+        firmware_available_version="1.4.1",
+        device_firmware_version="1.3.0",
+    )
+
+    resp = client.post("/api/frames/1/firmware/check", headers=csrf_headers(client))
+    assert resp.status_code == 200
+    data = resp.json()
+    assert data["update_available"] is False
+    assert data["latest_version"] == "1.4.1"
+    assert data["staged_version"] == "1.4.1"
+    assert data["running_version"] == "1.3.0"
+
+
+def test_update_available_reports_running_version(client, db_session, monkeypatch):
+    client.post("/setup", data={"username": "alice", "password": "hunter22"})
+    _setup_frame(
+        db_session,
+        monkeypatch,
+        "1.4.1",
+        firmware_available_version="1.3.0",
+        device_firmware_version="1.3.0",
+    )
+
+    resp = client.post("/api/frames/1/firmware/check", headers=csrf_headers(client))
+    assert resp.status_code == 200
+    data = resp.json()
+    assert data["update_available"] is True
+    assert data["running_version"] == "1.3.0"

server/tests/test_html_render.py

@@ -0,0 +1,65 @@
+"""app.html_render's shared ordered-dithering primitives -- ordered_dither
+and ordered_dither_regions -- exercised directly against synthetic
+images, no Chromium/Playwright involved (these two functions run purely
+on whatever Image render_html_to_image already handed back)."""
+
+from __future__ import annotations
+
+from PIL import Image
+
+from app import html_render
+from app.image_pipeline import DEFAULT_PALETTE_RGB
+
+_PALETTE = set(DEFAULT_PALETTE_RGB)
+# A muddy hue nowhere near any of the 6 exact palette colors -- at the
+# "modern" style's tuned default amplitude (48), this should still snap
+# flatly to a single nearest ink (see theme_tokens.py's module docstring
+# for why 48 was chosen for icon/text legibility); only a much higher
+# amplitude (as a rich theme's accent_amplitude would use) stipples it
+# into a multi-ink approximation.
+_RICH_HUE = (168, 75, 42)  # a terracotta-ish RGB, not one of the 6 inks
+
+
+def test_ordered_dither_output_is_exact_palette_colors():
+    img = Image.new("RGB", (40, 30), (128, 128, 128))
+    dithered = html_render.ordered_dither(img, None)
+    assert set(dithered.getdata()) <= _PALETTE
+
+
+def test_ordered_dither_regions_outside_the_region_matches_plain_dither():
+    """Pixels outside every accent_regions rect must come out identical
+    to a plain ordered_dither call at base_amplitude -- the region-aware
+    variant must not perturb anything it wasn't asked to."""
+    img = Image.new("RGB", (100, 80), (90, 140, 200))
+    base_only = html_render.ordered_dither(img, None, amplitude=48.0)
+    regions = html_render.ordered_dither_regions(
+        img, None, base_amplitude=48.0, accent_regions=[((10, 10, 40, 30), 130.0)]
+    )
+    for x in range(100):
+        for y in range(80):
+            if 10 <= x < 40 and 10 <= y < 30:
+                continue  # inside the accent region -- expected to differ
+            assert regions.getpixel((x, y)) == base_only.getpixel((x, y))
+
+
+def test_ordered_dither_regions_stipples_a_rich_hue_the_base_amplitude_would_flatten():
+    """The whole reason ordered_dither_regions exists: a rich accent hue
+    dithered at the base (icon/text-safe) amplitude just snaps to one
+    nearest ink, but the same hue in an accent region at a theme's higher
+    accent_amplitude resolves to a believable multi-ink stipple instead --
+    assert that difference directly, not just "some image came back"."""
+    img = Image.new("RGB", (60, 60), _RICH_HUE)
+    rect = (0, 0, 60, 60)
+
+    flat = html_render.ordered_dither(img, None, amplitude=48.0)
+    richer = html_render.ordered_dither_regions(img, None, base_amplitude=48.0, accent_regions=[(rect, 130.0)])
+
+    assert len(set(flat.getdata())) == 1
+    assert len(set(richer.getdata())) > 1
+    assert set(richer.getdata()) <= _PALETTE
+
+
+def test_ordered_dither_regions_with_no_accent_regions_matches_plain_dither():
+    img = Image.new("RGB", (30, 30), (50, 60, 70))
+    assert list(html_render.ordered_dither_regions(img, None, base_amplitude=48.0).getdata()) == \
+        list(html_render.ordered_dither(img, None, amplitude=48.0).getdata())

server/tests/test_migrations.py

@@ -92,6 +92,18 @@ def test_expected_columns_exist_on_current_schema():
     button_action_indexes = {idx["name"] for idx in inspector.get_indexes("frame_button_actions")}
     assert "ix_frame_button_actions_widget_button" in button_action_indexes  # migration 28
     assert {"hold_duration_ms", "next_hold_action", "back_hold_action", "last_cycled_layout_id"} <= frame_columns
+    assert {"last_displayed_image", "last_displayed_at"} <= frame_columns  # migration 30
+    assert "render_style" in weather_widget_columns  # migration 31
+    assert {"photo_palette_rgb", "photo_dither_strength"} <= frame_columns  # migration 32
+    assert "render_style" in battery_widget_columns  # migration 33
+    assert "render_style" in text_widget_columns  # migration 34
+    assert "render_style" in task_widget_columns  # migration 35
+    static_widget_columns = {c["name"] for c in inspector.get_columns("static_widget_configs")}
+    assert "render_style" in static_widget_columns  # migration 36
+    whiteboard_widget_columns = {c["name"] for c in inspector.get_columns("whiteboard_widget_configs")}
+    assert "render_style" in whiteboard_widget_columns  # migration 37
+    calendar_widget_columns = {c["name"] for c in inspector.get_columns("calendar_widget_configs")}
+    assert "render_style" in calendar_widget_columns  # migration 38
 
 
 # --- widget system backfill (migration 16 + _ensure_widgets_backfilled) ---
@@ -331,6 +343,25 @@ def test_migration_29_adds_hold_action_columns_to_an_existing_database(db_sessio
     assert frame.last_cycled_layout_id is None
 
 
+def test_migration_30_adds_now_displaying_columns_to_an_existing_database(db_session):
+    """Exercises _migration_30's real guarded ALTER path (frames isn't
+    dropped/recreated by the pre-widget-system replay tests, so its
+    columns must be added defensively, same reasoning as migration
+    26/27/29's own comments)."""
+    with db_module.engine.begin() as conn:
+        conn.execute(text("UPDATE schema_version SET version = 29"))
+
+    run_migrations()
+
+    with db_module.engine.connect() as conn:
+        version = conn.execute(text("SELECT version FROM schema_version")).scalar()
+    assert version == MIGRATIONS[-1][0]
+
+    frame = db_session.get(Frame, 1)
+    assert frame.last_displayed_image is None
+    assert frame.last_displayed_at == 0.0
+
+
 def test_migration_17_and_18_extract_tasks_into_a_standalone_multi_list_widget(db_session):
     """Exercises _migration_17 and _migration_18's actual data-extraction
     SQL back to back (the real "existing widget-system database

server/tests/test_now_displaying.py

@@ -0,0 +1,94 @@
+"""GET /api/frames/{id}/now-displaying -- the frozen half of the header
+preview pair (see routers/device.py's _record_last_displayed). Distinct
+from /preview (test_frame_preview.py): that one always live-renders,
+this one serves back exactly whatever bytes a device-facing endpoint
+last actually sent, recorded as a side effect of /frame/image,
+/frame/advance, and /frame/back."""
+
+from __future__ import annotations
+
+import io
+
+from PIL import Image
+
+from app.image_pipeline import logical_render_size
+from app.models import Frame
+
+from .conftest import link_user, login, make_user
+
+
+def test_now_displaying_404s_before_any_device_fetch(client, db_session):
+    client.post("/setup", data={"username": "alice", "password": "hunter22"})
+
+    resp = client.get("/api/frames/1/now-displaying")
+    assert resp.status_code == 404
+
+
+def test_frame_image_records_now_displaying(client, db_session):
+    client.post("/setup", data={"username": "alice", "password": "hunter22"})
+    frame = db_session.get(Frame, 1)
+
+    resp = client.get("/frame/image")
+    assert resp.status_code == 200
+
+    resp = client.get("/api/frames/1/now-displaying")
+    assert resp.status_code == 200
+    assert resp.headers["content-type"] == "image/png"
+    assert "X-Displayed-At" in resp.headers
+    assert float(resp.headers["X-Displayed-At"]) > 0
+
+    img = Image.open(io.BytesIO(resp.content))
+    assert img.size == logical_render_size(frame.orientation)
+
+
+def test_advance_and_back_also_update_now_displaying(client, db_session):
+    client.post("/setup", data={"username": "alice", "password": "hunter22"})
+    db_session.get(Frame, 1)
+
+    client.get("/frame/image")
+    first = client.get("/api/frames/1/now-displaying")
+    assert first.status_code == 200
+
+    resp = client.post("/frame/advance")
+    assert resp.status_code == 200
+    after_advance = client.get("/api/frames/1/now-displaying")
+    assert after_advance.status_code == 200
+
+    resp = client.post("/frame/back")
+    assert resp.status_code == 200
+    after_back = client.get("/api/frames/1/now-displaying")
+    assert after_back.status_code == 200
+    assert float(after_back.headers["X-Displayed-At"]) >= float(first.headers["X-Displayed-At"])
+
+
+def test_now_displaying_visible_to_linked_user(client, db_session):
+    client.post("/setup", data={"username": "alice", "password": "hunter22"})
+    bob = make_user(db_session, "bob")
+    frame = db_session.get(Frame, 1)
+    link_user(db_session, bob, frame)
+    client.get("/frame/image")
+
+    client.cookies.clear()
+    login(client, "bob")
+    resp = client.get("/api/frames/1/now-displaying")
+    assert resp.status_code == 200
+
+
+def test_now_displaying_hidden_from_unrelated_user(client, db_session):
+    client.post("/setup", data={"username": "alice", "password": "hunter22"})
+    make_user(db_session, "mallory")
+    client.get("/frame/image")
+
+    client.cookies.clear()
+    login(client, "mallory")
+    resp = client.get("/api/frames/1/now-displaying")
+    assert resp.status_code == 404
+
+
+def test_now_displaying_requires_login(client, db_session):
+    client.post("/setup", data={"username": "alice", "password": "hunter22"})
+    client.get("/frame/image")
+
+    client.cookies.clear()
+    resp = client.get("/api/frames/1/now-displaying")
+    assert resp.status_code in (401, 403)

server/tests/test_saved_layouts.py

@@ -27,6 +27,7 @@ from app.models import (
     TaskWidgetConfig,
     User,
     Widget,
+    WeatherWidgetConfig,
 )
 
 from .conftest import csrf_headers, link_user, login, make_user
@@ -56,6 +57,16 @@ def _add_tasks_widget(db_session, frame_id=1, x=3, y=0, w=2, h=2, sort_order=2)
     return widget
 
 
+def _add_weather_widget(db_session, frame_id=1, x=0, y=0, w=2, h=2, sort_order=1) -> Widget:
+    widget = Widget(frame_id=frame_id, widget_type="weather", x=x, y=y, w=w, h=h,
+                    sort_order=sort_order, created_at=time.time())
+    db_session.add(widget)
+    db_session.flush()
+    db_session.add(WeatherWidgetConfig(widget_id=widget.id))
+    db_session.commit()
+    return widget
+
+
 def _setup_alice(client) -> None:
     resp = client.post("/setup", data={"username": "alice", "password": "hunter22"})
     assert resp.status_code == 303, resp.text
@@ -89,6 +100,48 @@ def test_save_captures_placement_and_photo_settings_but_not_queue_state(client,
                            "queue_target_len": 30}
 
 
+def test_save_and_apply_round_trip_weather_settings(client, db_session):
+    _setup_alice(client)
+    weather = _add_weather_widget(db_session)
+    with db_session.no_autoflush:
+        wcfg = db_session.get(WeatherWidgetConfig, weather.id)
+        wcfg.mode = "daily"
+        wcfg.provider = "nws"
+        wcfg.units = "celsius"
+        wcfg.city_label = "Boston, MA"
+        wcfg.city_latitude = 42.36
+        wcfg.city_longitude = -71.06
+        wcfg.hourly_interval_hours = 6
+        wcfg.daily_days = 7
+        wcfg.checked_at = 12345.0
+        wcfg.cached = {"stale": "runtime state, not a setting"}
+    db_session.commit()
+    db_session.expunge(wcfg)
+
+    save_resp = client.post("/api/frames/1/layouts", json={"name": "Weather Layout"}, headers=csrf_headers(client))
+    assert save_resp.status_code == 200, save_resp.text
+    layout = db_session.query(SavedLayout).filter_by(user_id=1, name="Weather Layout").one()
+    snap = db_session.query(SavedLayoutWidget).filter_by(saved_layout_id=layout.id, widget_type="weather").one()
+    assert snap.config == {
+        "mode": "daily", "provider": "nws", "units": "celsius", "city_label": "Boston, MA",
+        "city_latitude": 42.36, "city_longitude": -71.06, "hourly_interval_hours": 6, "daily_days": 7,
+        "cities": None, "render_style": "classic",
+    }
+
+    client.delete("/api/frames/1/widgets", headers=csrf_headers(client))
+    apply_resp = client.post(f"/api/frames/1/layouts/{layout.id}/apply", headers=csrf_headers(client))
+    assert apply_resp.status_code == 200, apply_resp.text
+
+    new_widget = db_session.query(Widget).filter_by(frame_id=1, widget_type="weather").one()
+    new_cfg = db_session.get(WeatherWidgetConfig, new_widget.id)
+    assert (new_cfg.mode, new_cfg.provider, new_cfg.units) == ("daily", "nws", "celsius")
+    assert (new_cfg.city_label, new_cfg.city_latitude, new_cfg.city_longitude) == ("Boston, MA", 42.36, -71.06)
+    assert (new_cfg.hourly_interval_hours, new_cfg.daily_days) == (6, 7)
+    # Runtime fetch-cache state is never captured/restored by a saved layout.
+    assert new_cfg.checked_at == 0.0
+    assert new_cfg.cached is None
+
+
 def test_save_captures_calendar_sources_and_button_actions(client, db_session):
     _setup_alice(client)
     db_session.query(Widget).filter_by(frame_id=1, widget_type="photos").delete()

server/tests/test_theme_tokens.py

@@ -0,0 +1,92 @@
+"""app.theme_tokens -- resolve_theme()'s fallback logic (does "classic"
+stay a byte-identical no-op vs. each widget kind's pre-theme-system
+look?) and the font table every preset resolves against. No rendering
+here -- see test_html_render.py for ordered_dither_regions and each
+widget's own test_widgets_*.py for dispatch-level "does a theme actually
+change the output" coverage."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+from app import panel_style, theme_tokens
+
+
+def test_classic_weather_matches_historical_fixed_gradient():
+    """Weather's modern style never went through panel_style.THEME --
+    its header was always this fixed blue gradient (see html_render.py's
+    removed ACCENT_START/ACCENT_END). "classic" must reproduce it
+    byte-for-byte so themes are additive, not a silent regression."""
+    resolved = theme_tokens.resolve_theme("classic", "weather", None)
+    assert resolved["accent_hex"] == "#1c4fd6"
+    assert resolved["accent_hex_dark"] == "#6fa8ff"
+
+
+def test_classic_tasks_and_calendar_use_flat_theme_ink():
+    """Tasks/calendar's classic accent was always a flat single ink (no
+    gradient) resolved through panel_style.THEME -- both ends of the
+    "gradient" must be that same ink, not two different shades."""
+    tasks = theme_tokens.resolve_theme("classic", "tasks", None)
+    calendar = theme_tokens.resolve_theme("classic", "calendar", None)
+    assert tasks["accent_hex"] == tasks["accent_hex_dark"]
+    assert calendar["accent_hex"] == calendar["accent_hex_dark"]
+
+    from app.image_pipeline import DEFAULT_PALETTE_RGB
+
+    expected_tasks = "#%02x%02x%02x" % tuple(DEFAULT_PALETTE_RGB[panel_style.THEME_TASKS])
+    expected_calendar = "#%02x%02x%02x" % tuple(DEFAULT_PALETTE_RGB[panel_style.THEME_CALENDAR])
+    assert tasks["accent_hex"] == expected_tasks
+    assert calendar["accent_hex"] == expected_calendar
+
+
+def test_classic_unmapped_widget_kind_falls_back_to_black():
+    resolved = theme_tokens.resolve_theme("classic", "battery", None)
+    from app.image_pipeline import DEFAULT_PALETTE_RGB
+
+    assert resolved["accent_hex"] == "#%02x%02x%02x" % tuple(DEFAULT_PALETTE_RGB[panel_style.BLACK])
+
+
+def test_unknown_theme_name_falls_back_to_classic():
+    assert theme_tokens.resolve_theme("not-a-real-theme", "weather", None) == \
+        theme_tokens.resolve_theme("classic", "weather", None)
+    assert theme_tokens.resolve_theme(None, "weather", None) == \
+        theme_tokens.resolve_theme("classic", "weather", None)
+
+
+def test_every_preset_resolves_without_error_for_every_widget_kind():
+    widget_kinds = ["weather", "tasks", "calendar", "battery", "text", "static", "whiteboard"]
+    for theme_name in theme_tokens.THEMES:
+        for kind in widget_kinds:
+            resolved = theme_tokens.resolve_theme(theme_name, kind, None)
+            assert resolved["accent_hex"].startswith("#") and len(resolved["accent_hex"]) == 7
+            assert resolved["accent_hex_dark"].startswith("#") and len(resolved["accent_hex_dark"]) == 7
+            assert resolved["font_family"] in theme_tokens.FONT_FAMILIES
+            assert Path(resolved["font_regular"]).exists()
+            assert Path(resolved["font_bold"]).exists()
+
+
+def test_non_gradient_theme_has_equal_accent_stops():
+    """"moss" is configured with gradient=False -- its two CSS gradient
+    stops must be identical (a flat fill), unlike a gradient theme's."""
+    resolved = theme_tokens.resolve_theme("moss", "tasks", None)
+    assert resolved["gradient"] is False
+    assert resolved["accent_hex"] == resolved["accent_hex_dark"]
+
+
+def test_gradient_theme_has_a_darker_second_stop():
+    resolved = theme_tokens.resolve_theme("terracotta", "tasks", None)
+    assert resolved["gradient"] is True
+    assert resolved["accent_hex"] == "#a84b2a"
+    assert resolved["accent_hex_dark"] != resolved["accent_hex"]
+
+
+def test_font_path_covers_every_family_and_style_combination():
+    for family in theme_tokens.FONT_FAMILIES:
+        for bold in (False, True):
+            for italic in (False, True):
+                assert theme_tokens.font_path(family, bold, italic).exists()
+
+
+def test_font_path_falls_back_to_default_family_for_unknown_name():
+    assert theme_tokens.font_path("not-a-real-family", False, False) == \
+        theme_tokens.font_path(theme_tokens.DEFAULT_FONT_FAMILY, False, False)

server/tests/test_widget_config_and_queue_endpoints.py

@@ -243,6 +243,35 @@ def test_config_save_switching_mode_clears_the_now_incompatible_cache(client, db
     assert resp.status_code == 200, resp.text
 
 
+def test_preview_weather_honors_modern_render_style(client, db_session, monkeypatch):
+    """Regression test: api_widget_preview_weather originally called
+    weather_render.render_weather_preview_png directly, unconditionally --
+    the dialog's own live preview never reflected render_style="modern" at
+    all, even though the real device-facing render (widgets/weather.py's
+    render()) did. Route through html_render instead for modern/current or
+    modern/daily, same as the device path -- assert it's actually reached,
+    not just that the request 200s (it would 200 either way if this
+    silently fell back to classic)."""
+    client.post("/setup", data={"username": "alice", "password": "hunter22"})
+    widget = _add_weather_widget(db_session, mode="current", render_style="modern")
+    monkeypatch.setattr(
+        "app.routers.api_widgets.get_or_refresh_weather_widget_data",
+        lambda db, frame, widget, force=False: {"temp": 72.0, "category": "clear"},
+    )
+    calls = []
+
+    def _fake_render_html_to_image(html, target_w, target_h):
+        calls.append((target_w, target_h))
+        return Image.new("RGB", (target_w, target_h), (255, 255, 255))
+
+    monkeypatch.setattr("app.html_render.render_html_to_image", _fake_render_html_to_image)
+
+    resp = client.get(f"/api/frames/1/widgets/{widget.id}/preview/weather")
+    assert resp.status_code == 200, resp.text
+    assert resp.headers["content-type"] == "image/png"
+    assert calls, "html_render.render_html_to_image was never called -- preview endpoint didn't honor render_style"
+
+
 def test_config_save_truncates_an_overlong_tasks_name(client, db_session):
     client.post("/setup", data={"username": "alice", "password": "hunter22"})
     widget = _add_tasks_widget(db_session)