fix(lab): preserve explicit replay seeks

apps/control-station/src/components/laboratory/useRecordedEvidencePlayback.ts

@@ -45,6 +45,13 @@ export function synchronizeRecordedEvidencePlayback(
   observed: RecordedObservationPlayback,
   range: RecordedEvidencePlaybackRange,
 ): RecordedObservationPlayback {
+  if (!current.playing) {
+    // A paused transport also covers every explicit operator seek. Native
+    // callbacks from the previously displayed frame remain stale until the
+    // controlled video effect has applied that target, so they cannot move the
+    // shared LAB clock at all while the operator state is paused.
+    return current;
+  }
   const currentSeconds = clampRecordedEvidenceSeconds(observed.currentSeconds, range);
   return {
     ...current,

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

@@ -403,7 +403,23 @@ test("recorded VIDEO clock cannot reverse an explicit operator pause", () => {
       { currentSeconds: 15.1, playing: true, rate: 1 },
       range,
     ),
-    { currentSeconds: 15.1, playing: false, rate: 2 },
+    { currentSeconds: 15, playing: false, rate: 2 },
+  );
+  assert.deepEqual(
+    synchronizeRecordedEvidencePlayback(
+      { currentSeconds: 10, playing: false, rate: 2 },
+      { currentSeconds: 15.1, playing: true, rate: 1 },
+      range,
+    ),
+    { currentSeconds: 10, playing: false, rate: 2 },
+  );
+  assert.deepEqual(
+    synchronizeRecordedEvidencePlayback(
+      { currentSeconds: 12, playing: true, rate: 2 },
+      { currentSeconds: 15.1, playing: true, rate: 1 },
+      range,
+    ),
+    { currentSeconds: 15.1, playing: true, rate: 2 },
   );
   assert.deepEqual(
     synchronizeRecordedEvidencePlayback(