Merge upstream main (OSM sea-mark and ski-piste overlays) into pr/street-level-show-action

Keeps main's locale catalogs and re-adds this PR's eight Street Level strings; re-pins the Realtime payload digests for main's two new overlay layers, where the unchanged tools match main's pin, so show_street_level is still the whole difference.

src/i18n/locales/de.json

@@ -2943,6 +2943,8 @@
   "UTILITIES": "WERKZEUGE",
   "Exit cockpit to fly to a drawing": "Cockpit verlassen, um zu einer Zeichnung zu fliegen",
   "Directions, drawing and your own files": "Route, Zeichnen und eigene Dateien",
+  "Sea Marks": "Seezeichen",
+  "Ski Pistes": "Skipisten",
   "Press OPEN to load the photo": "Auf ÖFFNEN klicken, um das Foto zu laden",
   "Captured {month}": "Aufgenommen im {month}",
   "this spot": "diese Stelle",