Add server-side support for a second panel (13.3in Spectra 6 / EE02) and scaffold its firmware target

Server: Frame.panel_type (new column + migration) is auto-derived from
the device's reported board (X-Frame-Board), never user-set -- the
panel is a property of the hardware, not a picker in the UI.
image_pipeline's packing/render pipeline is parameterized by panel
geometry instead of hardcoded 800x480 globals, with the real confirmed
13.3in geometry (1600x1200) registered alongside the original 7.3in
panel. Existing 7.3in frames are unaffected (column default + board
mapping both resolve to the original panel).

Board identifiers are also renamed (devkit/xiao -> devkit_esp32c6/
xiao_esp32c6, plus new "ee02") since the EE02 board also carries a XIAO
module -- "xiao" alone stopped disambiguating hardware. The server
keeps accepting the legacy bare names indefinitely for already-flashed
devices.

Firmware: scaffolds a third build target (ee02, ESP32-S3 -- a real
chip-target change, not just a same-chip Kconfig variant like xiao) and
a new epd13in3e driver component skeleton. The actual panel init/LUT/
refresh register sequence isn't ported from vendor demo code yet (none
was available), so that component deliberately fails to compile
(#error) rather than risk sending unverified register values to real
hardware -- devkit/xiao are unaffected and build identically to before.
CI's ee02 build step is continue-on-error for the same reason.

server/app/routers/device.py

@@ -27,7 +27,14 @@ from ..auth import get_server_settings, require_device
 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
+from ..image_pipeline import (
+    draw_widget_border,
+    logical_render_size,
+    panel_size,
+    render_panel,
+    render_placeholder,
+    resolve_border_color,
+)
 from ..models import BatteryLog, Frame, FrameButtonAction, Widget
 from ..widgets import WIDGET_TYPES
 from .common import (
@@ -62,6 +69,7 @@ def _setup_placeholder(frame: Frame, request: Request, manage: dict | None = Non
             manage=manage,
             as_png=as_png,
             capture_snapshot=capture_snapshot,
+            panel_type=frame.panel_type,
         )
     if frame.owner_user_id is None:
         return render_placeholder(
@@ -71,6 +79,7 @@ def _setup_placeholder(frame: Frame, request: Request, manage: dict | None = Non
             manage=manage,
             as_png=as_png,
             capture_snapshot=capture_snapshot,
+            panel_type=frame.panel_type,
         )
     return render_placeholder(
         ["Almost there!", "Add a widget for this frame at", base],
@@ -80,6 +89,7 @@ def _setup_placeholder(frame: Frame, request: Request, manage: dict | None = Non
         manage=manage,
         as_png=as_png,
         capture_snapshot=capture_snapshot,
+        panel_type=frame.panel_type,
     )
 
 
@@ -141,7 +151,7 @@ def _render_widgets(db: Session, frame: Frame, manage: dict | None, is_normal_wa
     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)
+    panel_w, panel_h = logical_render_size(frame.orientation, *panel_size(frame.panel_type))
     regions = []
     if all_widgets:
         with ThreadPoolExecutor(max_workers=min(len(all_widgets), 8)) as pool:
@@ -160,7 +170,7 @@ def _render_widgets(db: Session, frame: Frame, manage: dict | None, is_normal_wa
         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,
+        capture_snapshot=capture_snapshot, panel_type=frame.panel_type,
     )
 
 
@@ -185,6 +195,7 @@ def _render_frame_content(db: Session, frame: Frame, request: Request | None, ma
             return render_placeholder(
                 ["Almost there!"], orientation=frame.orientation, palette_rgb=frame.palette_rgb,
                 manage=manage, as_png=as_png, capture_snapshot=capture_snapshot,
+                panel_type=frame.panel_type,
             )
         return _setup_placeholder(frame, request, manage=manage, as_png=as_png, capture_snapshot=capture_snapshot)
 
@@ -251,6 +262,23 @@ def _run_global_action(db: Session, frame: Frame, button: str) -> None:
         logger.exception("Global hold action %r failed for frame %d", action, frame.id)
 
 
+# Maps a device's self-reported board (X-Frame-Board, CONFIG_FRAME_BOARD_
+# NAME) to which EPD panel it drives -- the panel type is a property of
+# the board's firmware, not something a person picks in the UI (see
+# Frame.panel_type). Includes both the legacy bare names ("devkit",
+# "xiao") already baked into fielded firmware and the current chip-
+# qualified names ("devkit_esp32c6", "xiao_esp32c6") -- keep both
+# indefinitely, since already-flashed devices can't be retroactively
+# renamed and there's no cost to accepting either.
+BOARD_PANEL_MAP = {
+    "devkit": "epd7in3e",
+    "xiao": "epd7in3e",
+    "devkit_esp32c6": "epd7in3e",
+    "xiao_esp32c6": "epd7in3e",
+    "ee02": "epd13in3e",
+}
+
+
 @router.get("/frame/config")
 def frame_config(request: Request, frame: Frame = Depends(require_device), db: Session = Depends(get_db)):
     """Device-facing settings, polled by the frame alongside its
@@ -259,7 +287,10 @@ def frame_config(request: Request, frame: Frame = Depends(require_device), db: S
     signal. Also captures the device's running firmware version and board
     variant (X-Frame-Version/X-Frame-Board headers) and advertises the
     available OTA image's version, so the device's update check costs
-    zero extra round trips."""
+    zero extra round trips. The reported board also auto-sets
+    Frame.panel_type (see BOARD_PANEL_MAP) -- which EPD panel a frame
+    renders for is derived from what the hardware reports, never a manual
+    setting."""
     reported_version = request.headers.get("X-Frame-Version", "")
     reported_board = request.headers.get("X-Frame-Board", "")
     with frame_locked(db, frame.id) as locked:
@@ -272,6 +303,9 @@ def frame_config(request: Request, frame: Frame = Depends(require_device), db: S
             locked.device_firmware_version = reported_version
         if reported_board:
             locked.device_board_variant = reported_board
+            mapped_panel = BOARD_PANEL_MAP.get(reported_board)
+            if mapped_panel and mapped_panel != locked.panel_type:
+                locked.panel_type = mapped_panel
 
         response = {
             "refresh_interval_s": quiet_hours.effective_refresh_interval_s(locked),