feat(radio): render stations and clusters on Navara

Preserve native clustering, selection and direct-action playback through renderer ports. Record both-engine dev/preview, legacy, contract, shell and build evidence with remaining W2 limits.

package.json

@@ -64,6 +64,7 @@
     "cesium": "^1.124.0",
     "egm96-universal": "^1.1.1",
     "hls.js": "^1.7.3",
+    "kdbush": "4.0.2",
     "mapillary-js": "^4.1.2",
     "mgrs": "^2.1.0",
     "pbf": "^5.1.2",