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Three bugs that compound in Studio preview: 1. **Double audio on pause/resume**: syncRuntimeMedia played audio through the HTML <audio> element while WebAudioTransport simultaneously played the same source through AudioBufferSourceNode. Fixed by passing webAudio.isActive() as outputMuted so HTML elements stay muted when Web Audio owns playback. Also removed the priorMuted restore in stopAll() which raced with the next play cycle. 2. **Manifest polling loop**: applyStudioManualEditsToPreview and applyStudioMotionToPreview unconditionally fetched from disk on every call, even without forceFromDisk. The runtime posts state messages every frame via postMessage, triggering React re-renders that re-invoked these functions ~60x/second. Fixed by returning early when no disk read is requested, and using refs instead of callbacks in useEffect deps. 3. **Parent proxy double-play**: the player web component created parent-frame audio proxies even when the runtime bridge was available, causing two audio sources on autoplay-blocked promotion. Fixed by skipping proxy creation when _hasRuntimeBridge returns true, and synchronously muting iframe media on promotion to close the async race window. Also fixes pre-existing ResolutionPreset type missing square variants. Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>