Merge branch 'main' into upstream/voice-alias-hint-budget

changelog.d/1470-ukrainian.md

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+- Add Ukrainian (uk) to the language picker: the whole interface in Ukrainian,
+  with its four plural forms and Cyrillic HUD units. Based on the Ukrainian
+  translation by @meirm (#312) (German, @gekh, #1470).

changelog.d/871-vessels-idle-render.md

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+- Let the scene idle with AIS vessels enabled. Vessels no longer hold the
+  continuous render loop; they request frames for new data and selection, one
+  trailing frame after the camera stops, and hold the loop only while focus
+  emphasis animates or a vessel stays dimmed under a tracked target. A parked
+  vessels-only scene went from continuous rendering to 0 frames in 5 s. While
+  anything is tracked, the vessel focus pass skips hidden sprites at rest:
+  about 4 ms to 1.2 ms per pass over 12,000 vessels (waar19, #871).