Fixed
- Fixed notifications not appearing on macOS: 'notify-rust'/'mac-notification-sys' looks up a non-existent '"use_default"' app, triggering a "Where is ised_default?" dialog, and its 'NSUserNotificationCenter' API no longer delivers banners on modern macOS. Switched to 'mac-notification-sys' with 'set_application("org.work-break")' so notifications use the app's bundle identity and icon
- Fixed no notification on first launch: running without arguments now triggers a switch (which notifies) instead of starting silently