When a user disables "Show Tray Icon" in settings and also has "Start Hidden" enabled, the app launches into a completely unreachable state:

• The window is hidden (start hidden)
• The tray icon is hidden (show tray icon disabled)
• On macOS, the dock icon is removed (Accessory activation policy)

The app is running but there is no way to interact with it. The only recovery is re-launching from Spotlight or Applications, which triggers the
single-instance plugin to show the window. But on the next launch, the same invisible state occurs again.

Additionally, macOS had no RunEvent::Reopen handler, so clicking the dock icon (when visible) did nothing to bring the window back.

Fix

1. Prevent invisible app state on startup: When the tray icon is not available (either via the show_tray_icon setting or the --no-tray CLI flag), the app
   now forces the main window to be shown regardless of the start_hidden setting. On macOS, the activation policy is also reset from Accessory to Regular
   so the dock icon remains visible.
2. Add RunEvent::Reopen handler for macOS: Clicking the dock icon now calls show_main_window(), providing a recovery path for users whose app is running
   but has no visible window

TODO: Verify all possible code branches and make sure expectations are aligned for each