Merge origin/main into german/navara

Main's new layers (drone airspace, OSM places, sea marks, ski pistes) are
Cesium-only for now: they join the layer directory and the Cesium catalog,
are built afresh for each Cesium catalog, and show as unavailable on Navara.

The zoom-out guard is a scene part that attaches to Cesium globes only. The
awareness range pulses and their echoes draw on Cesium through the awareness
display's viewer; Navara keeps the plain range ring. Camera-input wakes go
through the display, and the analyst keeps the session-owned memory with
main's area presentation. A disposed voice runner aborts work in flight, and
an engine switch still keeps the last answer.

Modules main added that read Cesium while they load (zoomOutGuard,
awarenessEcho, the ground-sampling scratch in localGeojsonCore) now build
those values on first use or use src/geo, so a Navara page still starts
without the SDK. The OSM view box reads the engine's view rectangle.

Main grew its own main chunk by 93,873 bytes gzip-9 since the merge base, so
the baseline is raised to the merged size.

package.json

@@ -182,6 +182,7 @@
     "./layers/perimeters": "./src/layers/perimeters/index.js",
     "./layers/gnss": "./src/layers/gnss/index.js",
     "./layers/ghostmaps": "./src/layers/ghostMaps/index.js",
+    "./layers/drone-airspace": "./src/layers/droneAirspace/index.js",
     "./sources/firms-csv": "./src/data/firmsCsv.js",
     "./layers/firms": "./src/layers/firms/index.js",
     "./layers/satellites": "./src/layers/satellites/index.js",
@@ -261,6 +262,7 @@
     "./layers/perimeters/source": "./src/layers/perimeters/source.js",
     "./layers/gnss/source": "./src/layers/gnss/source.js",
     "./layers/ghostmaps/source": "./src/layers/ghostMaps/source.js",
+    "./layers/drone-airspace/source": "./src/layers/droneAirspace/source.js",
     "./layers/firms/source": "./src/layers/firms/source.js",
     "./layers/installations/source": "./src/layers/installations/source.js",
     "./layers/launches/source": "./src/layers/launches/source.js",