fix(perf): free a turned-off layer's entities that Cesium keeps (#1367)

Release stale Cesium command references after disabling a layer while preserving current-frame commands.

Contribution by @quanticsoul4772.

scripts/package-boundaries.json

@@ -2574,7 +2574,8 @@
       "src/voice/geminiSession.js",
       "src/voice/geminiAudio.js",
       "src/voice/geminiCaptureWorklet.js",
-      "src/ui/statusBadge.js"
+      "src/ui/statusBadge.js",
+      "src/sceneCommandRelease.js"
     ],
     "external": [
       "hls.js",