fix(lab): stream synchronized replay fragments

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

@@ -8,6 +8,7 @@ let server;
 let fetchRecordedMediaArchive;
 let recordedMediaPresentationState;
 let recordedMediaSeekableCoverage;
+let recordedMediaFragmentUrl;
 
 before(async () => {
   server = await createServer({
@@ -19,6 +20,7 @@ before(async () => {
     fetchRecordedMediaArchive,
     recordedMediaPresentationState,
     recordedMediaSeekableCoverage,
+    recordedMediaFragmentUrl,
   } = await server.ssrLoadModule("/src/components/RecordedFmp4Player.tsx"));
 });
 
@@ -144,13 +146,38 @@ test("decoded duration and seekable range cover the complete declared epoch", ()
   assert.equal(recordedMediaSeekableCoverage(20, 20, 20, 1, 1.01), false);
 });
 
-test("recorded player range-streams and never builds a whole-video RAM Blob", async () => {
+test("recorded player keeps full-archive range fallback and uses bounded generation-bound fragments", async () => {
   const source = await readFile(
     new URL("../src/components/RecordedFmp4Player.tsx", import.meta.url),
     "utf8",
   );
   assert.match(source, /video\.src\s*=\s*descriptor\.streamUrl/);
-  assert.doesNotMatch(source, /new Blob\(|response\.arrayBuffer\(|SourceBuffer/);
+  assert.doesNotMatch(source, /new Blob\(/);
+  assert.match(source, /new MediaSource\(\)/);
+  assert.match(source, /segmentSequence \+ 36/);
+  assert.match(source, /pumpRecordedSegmentWindow/);
+
+  const { manifest, generation } = fixture();
+  const epoch = {
+    ordinal: 1,
+    timelineStartSeconds: 0,
+    timelineEndSeconds: 36_000,
+    mediaType: manifest.epochs[0].media_type,
+    byteLength: manifest.epochs[0].byte_length,
+    streamUrl: manifest.epochs[0].stream_url,
+  };
+  assert.equal(
+    recordedMediaFragmentUrl(epoch, generation, "init"),
+    `/api/v1/observation-sessions/session-1/media/camera-1/epochs/1/init.mp4?generation=${generation}`,
+  );
+  assert.equal(
+    recordedMediaFragmentUrl(epoch, generation, 17),
+    `/api/v1/observation-sessions/session-1/media/camera-1/epochs/1/segments/17.m4s?generation=${generation}`,
+  );
+  assert.throws(
+    () => recordedMediaFragmentUrl(epoch, "b".repeat(64), 17),
+    /не привязан/,
+  );
 });
 
 test("loading and error overlays fully conceal recorded camera pixels", async () => {