Implement soft mute that doesn't affect system audio chain

[mr-byrd]

• Replace LiveKit's setMicrophoneEnabled(false) with setVolume(0) to mute audio at the WebRTC mixer level instead of disabling the audio track
• This prevents the microphone device from being released at the device level, keeping it available for other applications
• This fixes issues such as disabling the microphone in commet and leaving a session keeps the microphone disabled for other applications until the device is re-enabled either in commet or some other mechanism
• Disable audio level visualizer border when local user is muted to prevent misleading feedback
• Use local _softMuted state tracker combined with updateMuted() to signal mute state to LiveKit server to notify other users that the current user is muted through the LiveKit event without stopping the capture device

[Airyzz]

Thank you! would you mind trying to implement the same for the p2p calls which dont use livekit?

Also I think it would be a good idea to have an option in preferences to revert to use previous implementation just in case this introduces anything unexpected

[mr-byrd]

Sure, I can make it a preference and I'll look into the doing this for p2p as well.

Seeing as how LiveKit and the p2p implementation will be different I think it would be good to have them as separate toggles