fix(lab): seal RAV004 spatial replay transport

apps/control-station/src/workspaces/laboratory/M4ReplayThreatVisual.tsx

@@ -180,6 +180,7 @@ export function M4ReplayThreatVisual({
   showReferenceMediaLayers = true,
   showSpatialOverlaySummary = true,
   playbackTransport = "epoch-stream",
+  spatialPlaybackTransport = "auto",
   recoverTimestampStalls = false,
   onActiveSequenceChange,
 }: {
@@ -198,6 +199,7 @@ export function M4ReplayThreatVisual({
   showReferenceMediaLayers?: boolean;
   showSpatialOverlaySummary?: boolean;
   playbackTransport?: "segmented" | "epoch-stream";
+  spatialPlaybackTransport?: "auto" | "sealed-binary" | "json";
   recoverTimestampStalls?: boolean;
   onActiveSequenceChange?: (sequence: number | null) => void;
 }) {
@@ -293,6 +295,7 @@ export function M4ReplayThreatVisual({
     currentSeconds: playbackController.playback.currentSeconds,
     includeSpatialPoints: evidenceDemand.sourceSpatialPoints,
     endpointRoot: timelineEndpointRoot,
+    spatialPlaybackTransport,
   });
   const [videoSource, setVideoSource] = useState<ObservationSourceDescriptor | null>(null);
   const [videoLoading, setVideoLoading] = useState(false);
@@ -1143,6 +1146,7 @@ export function M4ReplayThreatVisual({
                 imageWidth={timeline.imageWidth}
                 imageHeight={timeline.imageHeight}
                 boxes={activeBoxes}
+                overlaySeconds={frame?.sessionSeconds}
                 semanticOverlay={mediaMode === "video" ? semanticOverlay : undefined}
                 pointCloudOverlay={mediaMode === "video" ? pointCloudOverlay : undefined}
                 ariaLabel={`${evidenceLabel} recorded-realtime frame ${frame?.sequence ?? 0}: ${activeBoxes.length} proposals`}

apps/control-station/src/workspaces/laboratory/VegetationShadowResult.tsx

@@ -80,6 +80,7 @@ function FullRouteReviewEvidence({
       classifiedSpatialLayer={sealedSpatialGap}
       evidenceLabel="RAVNOVES004TREE"
       playbackTransport="segmented"
+      spatialPlaybackTransport="sealed-binary"
       recoverTimestampStalls
       showReferenceMediaLayers
       showSpatialOverlaySummary

apps/control-station/src/workspaces/laboratory/useM4ThreatTimeline.ts

@@ -34,14 +34,14 @@ export function m4ThreatChunkWindowStarts(
   if (chunkSize < 1 || frameCount < 1) return [];
   return [
     activeChunkStart,
-    ...Array.from(
-      { length: RETAINED_CHUNKS_BEHIND },
-      (_, index) => activeChunkStart - (index + 1) * chunkSize,
-    ),
     ...Array.from(
       { length: PREFETCH_CHUNKS_AHEAD },
       (_, index) => activeChunkStart + (index + 1) * chunkSize,
     ),
+    ...Array.from(
+      { length: RETAINED_CHUNKS_BEHIND },
+      (_, index) => activeChunkStart - (index + 1) * chunkSize,
+    ),
   ].filter((start) => start >= 0 && start < frameCount);
 }
 
@@ -86,12 +86,14 @@ export function useM4ThreatTimelineFrame({
   currentSeconds,
   includeSpatialPoints = true,
   endpointRoot,
+  spatialPlaybackTransport = "auto",
 }: {
   resultId: string;
   timeline: M4ThreatTimeline | null;
   currentSeconds: number;
   includeSpatialPoints?: boolean;
   endpointRoot?: string;
+  spatialPlaybackTransport?: "auto" | "sealed-binary" | "json";
 }) {
   const [chunks, setChunks] = useState<ReadonlyMap<number, M4ThreatTimelineChunk>>(
     () => new Map(),
@@ -104,8 +106,10 @@ export function useM4ThreatTimelineFrame({
     totalBytes: 0,
   });
   const [playbackError, setPlaybackError] = useState<string | null>(null);
-  const binaryPlayback = endpointRoot === undefined
-    || endpointRoot === M4_THREAT_TIMELINE_ENDPOINT_ROOT;
+  const binaryPlayback = spatialPlaybackTransport === "sealed-binary"
+    || (spatialPlaybackTransport === "auto" && (
+      endpointRoot === undefined || endpointRoot === M4_THREAT_TIMELINE_ENDPOINT_ROOT
+    ));
   const inFlight = useRef(new Map<number, AbortController>());
   const chunksRef = useRef(chunks);
   const activeChunkStartRef = useRef<number | null>(null);