fix(editor): allow muting split segments independently

[akash1520]

Summary

Fixes #2109.

Adds segment-level audio muting for recording clips. After splitting a clip, each resulting segment can now be muted or unmuted independently from the editor sidebar.

Changes

• Add a persisted audioMuted property to timeline segments
• Add Segment Settings → Audio → Mute Audio
• Apply segment muting during preview and export
• Support normal-speed, retimed, and transitioning segments
• Preserve mute state when splitting or importing segments
• Default existing projects to unmuted for backward compatibility
• Keep the existing global mute control as the master control
• Leave imported/background audio controls unchanged

Testing

• cargo test -p cap-editor audio::tests
• cargo test -p cap-project timeline_segment_defaults_audio_muted_for_existing_projects
• cargo check -p cap --all-targets
• cargo check -p cap-desktop
• Desktop TypeScript typecheck
• Scoped Biome checks

UI after this PR

Greptile Summary

The PR adds independently persisted segment-level audio muting and applies it consistently during preview, export, splitting, and Cap-project import.

• Adds the audioMuted timeline-segment field with backward-compatible deserialization.
• Adds the editor sidebar control and project-state update action.
• Applies segment and global mute checks in the shared audio-rendering path.
• Preserves each source timeline segment’s mute value when importing a Cap project.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains; the previously reported import path now preserves each timeline segment’s mute state through the target timeline construction.

Important Files Changed

Filename	Overview
apps/desktop/src-tauri/src/import.rs	The revised Cap-project import path now copies each source timeline segment’s audio_muted value into the imported timeline, resolving the prior reset.
crates/editor/src/audio.rs	Segment muting is enforced before both normal-speed and retimed audio rendering while retaining global mute as the master control.
crates/project/src/configuration.rs	Adds persisted segment mute state with a false serde default for backward compatibility.
apps/desktop/src/routes/editor/ConfigSidebar.tsx	Adds a segment-level mute toggle wired to the selected timeline segment.
apps/desktop/src/routes/editor/context.ts	Adds the editor action that updates the selected segment’s persisted mute state.

_{Reviews (2): Last reviewed commit: "fix(editor): allow muting split segments..." | Re-trigger Greptile}

Context used (3)

• Knowledge Base — Desktop Tauri App (Rust Backend)
• Knowledge Base — Export and Rendering Pipeline
• Knowledge Base — Desktop Frontend (apps/desktop/src)

[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