## Summary
Enables audio playback in the native WebRTC video player and adds
mute/unmute controls. The previous implementation had audio disabled via
`useManualAudio = true` to avoid microphone permission requests.
**Key changes:**
- **Audio session configuration**: Uses
`AVAudioSession.Category.playback` for receive-only audio (no microphone
access required)
- **Remote audio track management**: Properly extracts audio track from
peer connection transceivers after remote SDP is set
- **Mute/unmute UI**: Added button at bottom-left of player using SF
Symbols (`speaker.wave.fill` / `speaker.slash.fill`)
- **State synchronization**: ViewModel mute state always reflects actual
audio track state
**Technical details:**
```swift
// Audio session configured for playback only
audioSession.setCategory(AVAudioSession.Category.playback.rawValue)
audioSession.setMode(AVAudioSession.Mode.spokenAudio.rawValue)
// Remote audio track extracted after SDP negotiation
remoteAudioTrack = peerConnection.transceivers
.first(where: { $0.mediaType == .audio })?
.receiver.track as? RTCAudioTrack
```
The implementation removes microphone-related warnings from the
experimental disclaimer.
## Screenshots
N/A - Audio feature, no visual changes beyond the mute button icon which
follows existing control patterns.
## Link to pull request in Documentation repository
Documentation: home-assistant/companion.home-assistant#
## Any other notes
Audio mode uses `.spokenAudio` for optimal voice/camera audio playback.
The mute button follows the same auto-hide behavior as other player
controls (3-second timeout).
<!-- START COPILOT CODING AGENT SUFFIX -->
<!-- START COPILOT ORIGINAL PROMPT -->
<details>
<summary>Original prompt</summary>
> Let's start supporting audio on WebRTCVideoPlayerView, including
control mute/unmute
</details>
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---------
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: bgoncal <5808343+bgoncal@users.noreply.github.com>
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## Summary
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## Screenshots
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## Link to pull request in Documentation repository
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Documentation: home-assistant/companion.home-assistant#
## Any other notes
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---------
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
