fix(video): prevent preview/presentation playback loop

- Avoid per-render target.set dispatch that reset playback

- Stop timer-based and per-frame React ticking while playing

- Add regression tests for render-loop sources

Made-with: Cursor

app/renderer/shared/PresentationView.tsx

@@ -53,7 +53,16 @@ export function PresentationView({
     } else {
       el.pause();
     }
-  }, [scene?.previewAssetId, scene?.previewAssetType, vp]);
+    // eslint-disable-next-line react-hooks/exhaustive-deps -- avoid reruns on 500ms heartbeats (serverNowMs-only updates)
+  }, [
+    scene?.previewAssetId,
+    scene?.previewAssetType,
+    previewUrl,
+    vp?.revision,
+    vp?.targetAssetId,
+    vp?.playing,
+    vp?.playbackRate,
+  ]);
 
   return (
     <div className={styles.root}>