Implement robust WebRTC polyfills and native audio session management for
LiveKit on mobile platforms. This includes configuring iOS audio sessions
to prevent issues during calls and implementing a delayed video
activation strategy to avoid main thread deadlocks on iOS.
- Add WebRTC and environment polyfills in `src/polyfills.ts`
- Implement iOS-specific `AudioSession` configuration in `LiveKitService`
- Add support for toggling speaker output on iOS
- Update `callStore` to handle video enablement after connection settles
- Fix `useUnreadCountQuery` to correctly handle async fetching
Migrate from @react-navigation/native to expo-router navigation hooks across all screens.
Add polyfills module and apply LiveKit VideoView optional loading for Expo Go compatibility.
Improve background sync to skip when user is not logged in.
Enhance fetchUnreadCount to return typed totalUnread and systemUnread values.