fix(viewer): preserve operator camera across AI layers

apps/control-station/src/components/RerunViewport.tsx

@@ -445,6 +445,7 @@ export async function fetchRecordedBlueprintRrd(
   identity: RecordedRerunIdentity,
   {
     origin,
+    blueprintSessionId,
     signal,
     activeView = "spatial",
     viewResetGeneration = 0,
@@ -457,6 +458,7 @@ export async function fetchRecordedBlueprintRrd(
     fetcher = globalThis.fetch,
   }: {
     origin: string;
+    blueprintSessionId: string;
     signal?: AbortSignal;
     activeView?: RecordedRerunView;
     viewResetGeneration?: 0 | 1;
@@ -488,7 +490,8 @@ export async function fetchRecordedBlueprintRrd(
       perceptionLayers.cuboids3d,
     ].some((value) => typeof value !== "boolean") ||
     identity.applicationId !== "nodedc_mission_core_recorded" ||
-    !/^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$/.test(identity.recordingId)
+    !/^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$/.test(identity.recordingId) ||
+    !/^[a-f0-9]{32}$/.test(blueprintSessionId)
   ) {
     throw new Error("Unsafe recorded blueprint request");
   }
@@ -502,6 +505,7 @@ export async function fetchRecordedBlueprintRrd(
     body: JSON.stringify({
       application_id: identity.applicationId,
       recording_id: identity.recordingId,
+      blueprint_session_id: blueprintSessionId,
       accumulation_seconds: settings.accumulationSeconds,
       show_grid: settings.showGrid,
       show_points: settings.showPoints,
@@ -635,6 +639,7 @@ export function RerunViewport({
   const perceptionChannelRef = useRef<RerunBlueprintChannel | null>(null);
   const loadedPerceptionChannelRef = useRef<RerunBlueprintChannel | null>(null);
   const recordedIdentityRef = useRef<RecordedRerunIdentity | null>(null);
+  const blueprintSessionIdRef = useRef(crypto.randomUUID().replaceAll("-", ""));
   const presentationGateRef = useRef(presentationGate);
   presentationGateRef.current = presentationGate;
   const [blueprintChannelRevision, setBlueprintChannelRevision] = useState(0);
@@ -1223,6 +1228,7 @@ export function RerunViewport({
     const abort = new AbortController();
     void fetchRecordedBlueprintRrd(recordedBlueprintUrl, sceneSettings, identity, {
       origin: window.location.origin,
+      blueprintSessionId: blueprintSessionIdRef.current,
       signal: abort.signal,
       activeView: recordedView,
       viewResetGeneration: recordedViewResetGeneration,

apps/control-station/src/workspaces/Workspaces.tsx

@@ -336,8 +336,10 @@ function SpatialWorkspace({
     (source) => source.capabilities.overlay && source.modality !== "point-cloud",
   );
   const recordedPerceptionSupported = recordedSource && perceptionAvailability !== "unavailable";
-  const recordedPerceptionEnabled = showDetections2d || showSegmentation || showCuboids3d;
-  const unifiedPerception = recordedPerceptionSupported && recordedPerceptionEnabled;
+  // Keep one stable original-video + world composition for every admitted
+  // perception recording. Layer buttons then only change entity visibility;
+  // they never reparent the 3D view or invalidate the operator's camera.
+  const unifiedPerception = recordedPerceptionSupported;
   const livePerceptionAvailable = !recordedSource && streamActive;
   const detections2dActive = recordedSource
     ? showDetections2d