Merge branch 'main' into denis/gev-news-layer

changelog.d/1574-transit-icon-heading.md

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+- Give transit vehicle icons a readable front: the bus, tram, metro and unknown
+  glyphs now carry a nose or cab in their outline, so the direction of travel
+  shows at fleet size and survives the sensor profiles. A vehicle with no known
+  course gets a symmetric outline instead of one that points north, and
+  switches to the pointed glyph once a course arrives (IMBrandao, #1574).

changelog.d/1656-stalled-feed-dims-tracked.md

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+- A tracked aircraft is dimmed as STALE while the whole flight feed is
+  stalled, as it is after a missed update, instead of staying at full
+  brightness (Sameh Khamis, @samehkhamis, #1656).