Govibe Nexus Video Player v3 Fedora clean launcher

Changes:
- User install still works even if accidentally launched with sudo.
- Main command now uses a clean launcher wrapper.
- Python/GTK deprecation warning spam is filtered from terminal.
- Legacy Gtk.StatusIcon fallback is disabled on Fedora/GNOME when AppIndicator is unavailable.
- Use Ctrl+C or close the window to exit from terminal. Ctrl+Z only suspends the app.
