Merge main into viewport diagnostics PR (#835)

Brings the branch up to main 72e2eba7. No conflicts; the net change against main is unchanged.

changelog.d/1528-s2-ghostmaps-age-filter.md

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+- Add an adjustable event-age filter across S2 GhostMaps products, defaulting
+  to seven days with 1-, 3-, 14- and 30-day choices and an All markers option.
+  Preserve undated features, save the selected window and expire old events
+  while the map stays open. Thanks @dylanmaniatakes (#1528).

changelog.d/1581-new-strings-translations.md

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+- Fix the translations of the voice area cards, the fire confidence filter,
+  the drone airspace layer and Sea Marks: one word for "landmark" per
+  language, the airspace layer names the airspace again, and Traditional
+  Chinese follows Simplified Chinese again (German, @gekh, #1581).

changelog.d/847-cyclone-shared-selection.md

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+- Let the voice assistant read the storm you select in Cyclone advisories:
+  its official advisory, position, intensity and movement. Clearing the
+  selection and the storm leaving the feed are reported apart (kvnloo, #847).

changelog.d/870-hidden-contact-dr.md

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+- Reduce dead-reckoning work for flights already hidden behind the horizon.
+  Hidden contacts update on a staggered one-in-13-ticks rotation (about once a
+  second) while visible contacts and contacts with fleet models retain the full
+  update path (Wilmer Alzate, #870).