signOut static method
Implementation
static Future<void> signOut() async {
final String? locale = ULocalStorage.getLocale();
final bool isDarkMode = ULocalStorage.isDarkMode();
await ULocalStorage.clear();
await UFileStorage.clear();
if (locale != null) ULocalStorage.setLocale(locale);
ULocalStorage.setDarkMode(isDarkMode);
_authFailureHandled = false;
_epoch++;
}