Dev fixes silent AI avatar by resolving WebRTC reconnection and microphone state bugs

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A developer building a browser-based AI avatar found that the avatar stopped responding after server restarts because the WebRTC connection had no reconnection logic. An exponential backoff retry mechanism was added, but reconnection still failed due to a guard clause that blocked a new connection while the old object persisted — fixed by calling disconnect before reconnecting. Even after successful reconnection, the avatar remained silent because the microphone track was not re-enabled, as its active state was not restored post-reconnect. The root cause turned out to be an old, disposal-marked microphone device that the browser had silently selected as the active input. The fixes — clearing stale connection objects, restoring microphone state on reconnect, and ensuring the correct device is selected — resolved the issue and preserved conversation history via sessionStorage.

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