Merge upstream main into pr/street-level-show-action

Re-pin the Realtime payload digests for main's control_cockpit wording.

changelog.d/1319-cctv-bosch-mic-specs.md

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+- Vendor the Bosch MIC PTZ datasheet records that the City of Amsterdam camera
+  register names (MIC-7522, MIC-7502, MIC-7130), with the register's `x` colour
+  wildcard as an alias, from the CCTV Camera Database v2.29.0 (ch-bas, #1319).

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/1481-rio-transit.md

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+- Add Rio de Janeiro to the Transit layer: municipal buses and the Mobi-Rio BRT
+  from SMTR's keyless GTFS-Realtime feeds (CC BY 4.0), the layer's first Latin
+  American region. Rio's internal route keys are joined to SMTR's published
+  GTFS `routes.txt`, so a card reads "Route SN731" rather than
+  "Route O0731AAN0A" (IMBrandao, #1481).

changelog.d/1521-provider-labels.md

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+- Cockpit Contact counts and the Contacts list name the provider that
+  answered, marked `FALLBACK` or `STALE` as in the Layers panel. Flights from
+  the adsb.lol fallback no longer read OpenSky, and vessels no longer always
+  read AISStream (German, @gekh, #1521).

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/1546-chat-provider-switch.md

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+- Keep typed chat's view when switching AI Provider: Settings opened from
+  chat stay chat's Settings for the new provider instead of falling back to
+  voice and widening the dock. Opening chat or closing the
+  voice panel now also clears a voice error left on the dock (Manjunath,
+  @manjunath22466, #1546).

changelog.d/1556-cockpit-own-layer-entry.md

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+- Enter Cockpit with only the ridden aircraft's layer on. Contacts is no longer
+  required, and ending Contacts mid-session keeps the view and the layer it
+  rides; turning off the aircraft's own feed ends the view, a missing other
+  feed reads `… FEED OFF · PARTIAL PICTURE`, and double-clicking the followed
+  aircraft or the entry beside its readout enters it (Denis Groshev, @ZloyS,
+  #1556).

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).