Merge branch 'main' into refactor/tile-budget

changelog.d/1576-transit-bikeshare-coverage-prompt.md

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+- Say why Transit and Bike Share are empty outside coverage. Over a city with
+  no feed or system (London, Tokyo) their Layers rows say so and count the
+  covered regions or systems, or say how low to fly, instead of `never`;
+  leaving coverage clears the last-update time (German, @gekh, #1576).