feat: add Studio Sound microphone enhancement

[richiemcilroy]

Adds Studio Sound to the Sound tab in both editors, with a shared default for new Studio recordings. It reduces microphone noise during playback and export, preserves original media and source timing, and leaves system audio and music unchanged. Live toggles retain the video engine and transport controls; export processes bounded source windows.

Validation: six processor tests, 20-variant sample-exact playback/export parity, microphone/system isolation, live PCM refresh, stale-generation cancellation, and macOS segmented-video handoff with the original seek/stop handle. Tauri and GPUI cargo checks, desktop TypeScript and scoped Biome passed. A complete 2h24m recording streamed successfully with the effect off/on; an isolated release processor measured about 1.2% of one CPU core in real time and 2.5 MB peak RSS.

Interactive GUI/device timing and native Windows/Linux playback remain unverified. Scoped Clippy reported no diagnostics in changed files; strict Rust 1.95 Clippy is blocked by existing warnings in audio latency/progressive code.

Confidence Score: 5/5

The PR appears safe to merge; the prior live-refresh positioning concern is resolved and no new actionable failures remain.

Summary

• Introduces bounded RNNoise-based microphone processing while leaving system audio and music unchanged.
• Integrates enhancement into preview, playback refresh, variable-speed rendering, and export.
• Adds Studio Sound controls and shared defaults to the Tauri and GPUI clients.
• Realigns replacement audio during live toggles and rejects stale refresh work.
• Adds processor, playback, export-parity, isolation, cancellation, and segmented-video tests.

_{Reviews (2) · Last reviewed commit: "fix: preserve audio position when toggli..."}

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	cargo/​nnnoiseless@​0.5.2

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[richiemcilroy]

hey @greptileai, please re-review the PR