Two specs for the video/screenshare experience:
1. SCREENSHARE-AUDIO.md — system audio capture + per-tile mute
2. VIDEO-FOCUS-MODE.md — Discord-style opt-in viewing with focus layout
The refactored LiveKit session dropped track.attach() for remote audio,
so no <audio> element was created and remote participants were silent.
Also refactors noise suppression to use LiveKit TrackProcessor API,
adds input volume gain node bypass at 100%, and exposes __lkDebug()
on window for DevTools diagnostics.
- BUG-039: switchOutputDevice continues loop on partial failure instead of early return
- BUG-040: clearOnError() prevents stale callback after MainPage destroy
- BUG-041: voice store tests cover localCamera, localScreenshare, setLocalSpeaking
- BUG-042: auth store updateUser tests and UserBar mute/deafen callback tests
- BUG-043: switchInputDevice guards against no active WebRTC session
- BUG-044: replace synchronous confirm() with double-click-to-delete via toast
- BUG-045: isSafeUrl() blocks javascript: URLs in image attachment src