saveState method
Implementation
Future<void> saveState() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
// Save theme
prefs.setString('themeEnum', _themesEnum.value.toString());
// Save dark mode state
prefs.setBool('isDarkMode', isDarkMode.value);
// Preservation language
prefs.setString('langEnum', language.value.toString());
}