* Give the microphone level its own observable
* Add a microphone level meter
* Show speakers and microphones in the quick audio menu
* Wire speaker selection through the call footer
* Add stories for the meter and the device menu
* Add end-to-end specs for the quick audio menu
* Keep the footer while a menu opened from it is open
* Use the shared audio capture stub in the lobby test
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Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
