fix(recording): recover footage after an early muxer restart

[yashranaway]

if the recording muxer restarted before finishing its first fragment, all the screen footage ended up in the restart folder and the main folder only had a half written fragment. recovery checked the main folder, found nothing complete, and said there was nothing to recover, so the whole recording was lost even though the footage was right there.

now recovery looks in the restart folders when the main one is empty, and finishing doesn't give up on an empty first group before checking them. tests use real encoded fixtures, including a cut off tail and a corrupt restart.

🤖 Generated with Claude Code

Confidence Score: 5/5

The PR appears safe to merge; no actionable issues were found.

Summary

Recovery now finds display footage in restart folders when the original folder has no usable fragments.

• Studio recovery finds video stored in numbered restart folders.

Tests were reviewed but not executed.

_{Reviews (1) · Last reviewed commit: "fix(recording): recover footage after an..." · Reviewed by Greptile}

[yashranaway]

@greptileai review

[vercel]

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