On stock GNOME there is no StatusNotifier host, so choosing "Keep
running in the tray" hid the window with no icon to bring it back.
Expose whether org.kde.StatusNotifierWatcher has an owner on the
session bus (always true off Linux); cinny's dialog then defaults to
Quit and words the other option as "running in the background".
Refs #37
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5