New widget type with four display modes -- current conditions, an hourly forecast strip, a multi-day forecast, and several cities' current day side by side -- backed by a pluggable provider registry (app/weather/, mirroring the app/widgets/ dispatch pattern): Open-Meteo (worldwide) and NWS (US-only) both wired up now, Environment Canada documented as the next one to add given its more involved station/grid-lookup API. The calendar widget's existing embedded weather strip is untouched and still Open-Meteo-only; this lifts the same underlying icon-drawing primitives (now shared via app/weather_render.py, calendar_render.py still imports draw_weather_row unchanged) into a widget that can be placed and sized on its own. Icons are redrawn in the panel's actual ink colors (yellow sun/bolt, blue rain/snow) instead of flat black, and build_multi_city's icon/font sizing now scales with how many cities need to fit rather than the box's height alone -- both fixed after catching them via live browser verification, along with a mode-switch cache-shape crash and a mobile-width dialog overflow. New WeatherWidgetConfig table (migration 24), grid footprint, widget module, common.py fetch/cache helper, router endpoints (location set/ clear, city add/remove, preview), dialog template + JS, and full test coverage (providers, widget render, HTTP endpoints, migration replay). docs/widgets.md and CLAUDE.md's TODO updated accordingly.