Bugfix/mic stream

[ariksfaradi]

Fixing mute/unmute microphone issues

Add light functionality that doesn't close the stream publication but replaces the current track with null

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Note

Introduces first-class microphone mute/unmute and centralizes mic management.

• Adds muteMicrophoneStream/unmuteMicrophoneStream across StreamingManager, LiveKit manager, agent-manager, and types; LiveKit implementation uses RTCRtpSender.replaceTrack(null|mediaStreamTrack) to mute/unmute without unpublishing

• New useMicrophoneStream hook consolidates device selection, acquisition, publish/unpublish, and mute/unmute; demo/app.tsx rewired UI to this hook and simplified legacy mic logic

• Extends tests in livekit-manager.test.ts to cover mute/unmute flows, error cases, and multiple cycles

• Minor refactors: remove isMicrophonePublished, streamline device enumeration, and avoid redundant LiveKit imports

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