fix(lab): make recorded replay seek-safe

apps/control-station/test/m4ReplayThreat.test.mjs

@@ -14,6 +14,7 @@ let selectM4ThreatTimelineSequence;
 let advanceRecordedEvidencePlayback;
 let synchronizeRecordedEvidencePlayback;
 let m4ThreatChunkWindowStarts;
+let cancelM4ThreatChunkRequestsOutsideWindow;
 let buildM4LocalSurface;
 
 const resultId = `m4-threat-replay-${"a".repeat(64)}`;
@@ -38,7 +39,10 @@ before(async () => {
   } = await server.ssrLoadModule(
     "/src/components/laboratory/useRecordedEvidencePlayback.ts",
   ));
-  ({ m4ThreatChunkWindowStarts } = await server.ssrLoadModule(
+  ({
+    m4ThreatChunkWindowStarts,
+    cancelM4ThreatChunkRequestsOutsideWindow,
+  } = await server.ssrLoadModule(
     "/src/workspaces/laboratory/useM4ThreatTimeline.ts",
   ));
   ({ buildM4LocalSurface } = await server.ssrLoadModule(
@@ -375,6 +379,23 @@ test("M4.6 spatial buffering keeps previous, active and two future chunks", () =
   assert.deepEqual(m4ThreatChunkWindowStarts(0, 24, 4489), [0, 24, 48]);
 });
 
+test("M4.6 spatial buffering drops stale in-flight windows across rapid jumps", () => {
+  const aborted = [];
+  const controller = (start) => ({ abort: () => aborted.push(start) });
+  const inFlight = new Map(
+    m4ThreatChunkWindowStarts(0, 24, 4489).map((start) => [start, controller(start)]),
+  );
+  for (const activeStart of [1488, 4488]) {
+    const desired = m4ThreatChunkWindowStarts(activeStart, 24, 4489);
+    cancelM4ThreatChunkRequestsOutsideWindow(inFlight, desired);
+    for (const start of desired) {
+      if (!inFlight.has(start)) inFlight.set(start, controller(start));
+    }
+  }
+  assert.deepEqual([...inFlight.keys()], [4464, 4488]);
+  assert.deepEqual(aborted, [0, 24, 48, 1464, 1488, 1512, 1536]);
+});
+
 test("recorded evidence clock advances by selected rate and stops at the sealed end", () => {
   const range = { startSeconds: 10, endSeconds: 20 };
   assert.deepEqual(
@@ -448,6 +469,7 @@ test("M4.6 viewer keeps media and spatial panes on one playback clock", async ()
   assert.match(visual, /const spatialFrame = frame\?\.spatialAvailable/);
   assert.match(visual, /<ObservationTimeline/);
   assert.match(visual, /useM4ThreatTimelineFrame/);
+  assert.match(visual, /resolveObservationSessionReplay\(timeline\.recordedSourceSessionId/);
   assert.match(visual, /label: "VIDEO"/);
   assert.match(visual, /label: "CAMERA"/);
   assert.match(visual, /label: "3D"/);
@@ -463,11 +485,11 @@ test("M4.6 viewer keeps media and spatial panes on one playback clock", async ()
   assert.match(visual, /secondaryMode=\{\{/);
   assert.match(visual, /playback=\{playbackController\.playback\}/);
   assert.match(visual, /clock: mediaMode === "video" \? "external" : "animation"/);
-  assert.match(visual, /segmentSequence=\{frame \? frame\.sequence \+ 1 : undefined\}/);
+  assert.match(visual, /timelineFrame\.activeSequence \+ 1/);
   assert.match(visual, /segmentCount=\{timeline\.frameCount\}/);
   assert.match(visual, /onPlaybackChange=\{playbackController\.synchronize\}/);
+  assert.match(visual, /onPlayingRejected=\{\(\) => playbackController\.setPlaying\(false\)\}/);
   assert.match(visual, /currentSeconds: playbackController\.playback\.currentSeconds/);
-  assert.doesNotMatch(visual, /setPlaying\(false\)/);
   assert.match(visualCss, /m4-replay-threat-visual__deck > \.nodedc-split-pane/);
   assert.match(visualCss, /m4-replay-threat-visual__pane-toolbar\[data-pane-toolbar="media"\]/);
   assert.match(visualCss, /m4-replay-threat-visual__pane-toolbar\[data-pane-toolbar="spatial"\]/);