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
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