1. Notifications/messages lagged when the desktop window was backgrounded —
Electron throttles hidden renderers by default, stalling the chat WS's
onmessage + timers. Set backgroundThrottling:false → real-time in the tray.
(Transport is WebSocket; no Firebase needed.)
2. Joining a call via the header Join button left the Join/Decline invite popup
on screen — enterMeeting now dismisses the invite (and stops the ring).
3. Seen-by is now "Message info": real contact DPs, a "Not seen yet" list for
groups, and dark lettering (white-on-pastel initials were invisible).
4. App-icon unread badge: red→pink gradient pill with a white ring + shadow,
drawn at 2x, instead of a flat red disc.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>