The host-leave confirmation dialog's Close the Room button only called
finish(), relying on VM.onCleared() to release the AudioRecord. That
runs late in the destroy lifecycle, so the system mic-in-use indicator
stayed lit while the activity was queued for destruction.
Adds NestViewModel.leave(), which mirrors onCleared() (sets closed,
runs both teardowns with finalCleanup=true so closes route through
cleanupScope/GlobalScope and survive Activity destruction). Wires it
into the Close the Room callback only — the Just Leave and non-host
Leave paths are unchanged per request.
Claude
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