saveToken method
Implementation
Future<void> saveToken(String accessToken, String csrfToken) async {
SharedPreferences prefs = await SharedPreferences.getInstance();
await prefs.setString('token', accessToken);
await prefs.setString('csrfToken', csrfToken);
await prefs.setInt('tokenExpirationTime',
DateTime.now().add(const Duration(minutes: 60)).millisecondsSinceEpoch);
print('Tokens saved: Access Token: $accessToken, CSRF Token: $csrfToken');
}