Implement m4s recording with recovery #1419
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Implement fragmented MP4 (M4S) recording for studio mode to enable recovery of incomplete recordings.
The previous recording method could lead to lost recordings if the application crashed mid-recording. By using fragmented MP4, video data is written incrementally, allowing the recovery mechanism to reconstruct a playable recording from the last successfully written fragment, even if the recording process is interrupted. This PR introduces a new fragmented MP4 muxer, integrates it into the recording pipeline for both Windows and macOS, and adds metadata tracking and editor-side recovery logic.