System tray with sign request notifications (desktop) #208
Description
Desktop bunker needs persistent system tray presence:
- Tray icon with connection status (connected/disconnected)
- OS notifications for incoming sign requests (click to open approval UI)
- Tray menu: open window, toggle bunker on/off, lock, quit
- Minimize to tray instead of closing
- Optional start minimized to tray
Blocked by #193 (NIP-46 bunker mode must land first).