Add MutationObserver to neutralize LiveKit's re-attached <audio> elements,
mark our keep-alive elements with data-opencord, detach tracks on unsubscribe,
remove dangerous blanket .play(), and soften compressor to transparent limiter.
Show local user's own screen share in their stream tile by bypassing
the isSubscribed check for local participants and auto-watching/unwatching
local streams on publish/unpublish. Eliminate audio double-playback by
detaching LiveKit's auto-attached audio elements so GlobalAudioRenderer
is the sole playback path, making attenuation and volume controls effective.
Fix GainNode leak in useAudioTrackPlayer cleanup paths.
Streams no longer auto-focus into large view when they start — tiles
stay in the equal-size grid until manually clicked. Audio playback is
moved out of VoiceUser/StreamTile into a new GlobalAudioRenderer
component rendered in AppLayout so it survives channel navigation.