fix(editor): clip overlapping music once after mixing

[yashranaway]

when music tracks overlap on the timeline, each one was clipped to the -1..1 range as it got added, before the later tracks were mixed in. so the result depended on track order: two loud tracks could clip early and a third track that should have pulled the level back down couldn't, while the same tracks in another order came out fine.

now all the music is summed first, and only the frames that actually got music are clipped, once, at the end. recording only frames pass through untouched, since clip volume can push them past 1.0 and adding music elsewhere shouldn't change them. playback and export both go through this path, and the audio oracles pass.

Confidence Score: 5/5

The PR appears safe to merge.

Summary

The PR sums overlapping music before clipping. The latest change limits clipping to frames that actually receive music.

• Overlapping music tracks are summed before their shared output is clipped.

_{Reviews (2) · Last reviewed commit: "fix(editor): clip only frames that recei..." · Reviewed by Greptile}

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[yashranaway]

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[yashranaway]

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