Uses ksni (StatusNotifierItem via zbus) so we keep our pure-Rust /
no-GTK stack — zbus is already pulled in by notify-rust and rfd.
Behavior:
- Tray icon shows the bundled icon.png; left-click brings the window
back to focus
- Right-click menu: Show / Hide / Quit
- Clicking the window's X button minimizes to tray instead of exiting
- Ctrl+Q (or the tray's Quit item) actually exits
Failure modes are silent and non-blocking: no DBus → app behaves as if
tray flag was off. No StatusNotifier host (e.g. GNOME without the
AppIndicator extension) → icon invisible but app still runs normally,
and the X-button close cancellation only fires when the tray spawn
returned a handle.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
