revert: undo PRs 625 and 626

[meiiie]

Summary

This reverts the runtime changes from:

• fix(audio): preserve mac sidecar track controls #625 fix(audio): preserve mac sidecar track controls
• fix(linux): stabilize portal source selection HUD #626 fix(linux): stabilize portal source selection HUD

I intentionally did not include #624 in this revert PR. I tested reverting #624 as well, but that PR is mostly baseline/test alignment plus a small preset-persistence fix; reverting it makes the current test suite fail against the current runtime contracts (cursorStyle default, webcam render-source tests, audio mainBufferEntry contract, and fallback import timing). Keeping #624 avoids turning this revert into a test-baseline regression.

Why

Recent user reports suggest v1.3.3 may have introduced regressions around editor/audio/HUD behavior. This PR is a conservative rollback of the two runtime patches most likely to affect those areas, while keeping the verified baseline cleanup from #624.

Validation

• git diff --cached --check
• npx tsc --noEmit
• npx biome check electron/electron-env.d.ts electron/hudOverlayBounds.test.ts electron/hudOverlayBounds.ts electron/ipc/recording/mac.ts electron/preload.ts electron/windows.ts src/components/video-editor/timeline/TimelineEditor.tsx src/components/video-editor/timeline/hooks/useTimelineAudioPeaks.ts src/hooks/useScreenRecorder.test.ts src/hooks/useScreenRecorder.ts src/lib/exporter/audioEncoder.test.ts src/lib/exporter/audioEncoder.ts
• npx vitest run electron/hudOverlayBounds.test.ts src/hooks/useScreenRecorder.test.ts src/lib/exporter/audioEncoder.test.ts src/components/video-editor/editorPreferences.test.ts src/lib/exporter/modernFrameRenderer.test.ts src/lib/exporter/modernVideoExporter.fallback.test.ts --reporter=verbose
• npm test (87 files, 767 tests passed)

Notes

• npm run build:win was attempted, but it exceeded the 5-minute local timeout before completion, so it is not counted as passed validation.
• A separate mechanical revert of test: restore main baseline verification #624/fix(audio): preserve mac sidecar track controls #625/fix(linux): stabilize portal source selection HUD #626 was checked locally and rejected because reverting test: restore main baseline verification #624 made targeted tests fail.

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• Create PR with unit tests
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