Merge main into feat/rio-transit-gtfs-rt

changelog.d/1426-fire-intensity-filter.md

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+- Color every Active Fires detection by fire radiative power on a six-stop
+  ember → white-hot ramp (ember · red · flame · orange · gold · white-hot at
+  0 · 5 · 20 · 50 · 100 · 300 MW, brighter as power rises), and add a
+  log-scale minimum-FRP slider whose track is the ramp, an All / Nominal+ /
+  High confidence switch and an "N of M shown" counter to the layer row. Far
+  zoom shows a Snap Map–style heatmap in the same colors instead of squares,
+  one distinct spot per fire, empty where nothing burns, and cross-fades with
+  the markers around 4,500 km with no gap, keeping weak fires as markers. The filter applies once before
+  rendering, so markers, cards, the heatmap, context and the top-fires query
+  agree; share links keep it (`w` token: `f`, `c`), and `get_active_fires`
+  takes matching `min_frp_mw` and `confidence` arguments. Default 0 MW / All
+  (gekh, #1426).

changelog.d/1535-fires-empty-heat-reenable.md

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+- Keep retained Active Fires heat imagery hidden when an empty filtered layer is
+  re-enabled while a new snapshot is pending (radianx, #1535).

changelog.d/1561-chat-autocomplete-arabic-marks.md

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+- Chat autocomplete finds Arabic suggestions typed without short vowels or
+  shadda, so «تتبع» now suggests «اعرض تتبّع الرحلات المباشر»
+  (German, @gekh, #1561).