fix(editor): allow muting split segments independently

[akash1520]

Summary

Fixes #2109.

After splitting a recording clip, each resulting timeline segment keeps its own persisted mute state. Muting a segment preserves its selected pitch/speed processing mode, and unmuting restores that mode. Existing projects remain compatible, including clips muted using speedAudioMode.

Changes

• Merge current main and integrate segment muting with the current Solid and GPUI clip menus, volume controls, and cursor settings.
• Apply audioMuted in preview, normal and retimed rendering, and the streaming export path, including both sides of transitions.
• Refresh active playback when segment mute changes and reject edited mute state in the preparation path that requires an unchanged timeline.
• Preserve mute when splitting, merging, and importing Cap projects; regenerate the TypeScript segment binding from the Rust schema.
• Keep global recording mute and timeline/background audio behavior consistent with the existing editor.

Validation

Passed locally:

• cargo check -p cap-project --locked
• cargo test -p cap-project --lib — 140 tests
• Expanded mute persistence/backward-compatibility test
• Desktop TypeScript check (tsc --project apps/desktop/tsconfig.json --noEmit)
• Clip audio and merge Vitest checks — 8 tests
• Scoped Biome checks, workspace Rust formatting, GPUI Rust formatting, and git diff --check

Added regression coverage for segment isolation, retimed mute, streaming exports with crossfade/fade-through-black, active playback refresh, preparation validation, split/unmute behavior, merge preservation, and import preservation.

Native validation is incomplete locally: cargo test -p cap-editor --lib segment_mute and cargo check -p cap-desktop --all-targets stop in the cidre dependency because this Mac has Command Line Tools but no full Xcode installation. Editor, backend/import, and GPUI native tests still need CI validation. No manual UI/audio playback verification was performed.

[richiemcilroy]

hey! can you please get this to a 5/5?

[akash1520]

Hey @richiemcilroy, could you re-run Greptile on this? I've fixed the import regression it flagged and added a test covering it, so it should score 5/5 now.

[richiemcilroy]

hey @greptileai please re-review the pr

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[akash1520]

Closing this PR as superseded by changes already in main:

• 727ac5a5f fixed independent split-segment muting in playback and export, with regression coverage.
• 8b347ebce added the clip settings menu with the Mute clip option.

The original behavior requested in #2109 is already implemented, so this PR's additional audioMuted field is unnecessary for that fix. Thanks for the review!