observeLocalMicSample$ switchMapped on every allConnections$ emission,
which re-emits far more often than the set of rooms changes. Each one
stopped the clone, closed the AudioContext and emitted null, and the
null reset the muted-speech gate, so the "You're muted" nudge could
never stay true long enough to fire. Map to the room list and only
restart when it actually changes.
Fixes#45
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5