Merge branch 'main' into upstream/tools-heading-wrap

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).