Screen sharing with audio captured the app's own voice playback, causing
users to hear themselves echoed back. Fixed via two layers:
- Add restrictOwnAudio constraint (Chrome 141+/Chromium 144) to exclude
the app's own audio from system audio capture
- Add shareAudio toggle so users can disable system audio entirely
- Remove outdated macOS audio block (now supported via ScreenCaptureKit)
- Upgrade Electron 33→40 (Chromium 130→144) so restrictOwnAudio works
natively in the desktop app
- Add NSAudioCaptureUsageDescription for macOS 14.2+ audio capture
- Add GTK 3 fallback for Linux GNOME compatibility (Electron 36+)