listThreads method

Implementation

@override
Future<List<ChatThread>> listThreads() async {
  final threads = _threads.values.toList();
  threads.sort((a, b) {
    final at = a.updatedAt, bt = b.updatedAt;
    if (at == null || bt == null) return 0;
    return bt.compareTo(at); // newest first
  });
  return threads;
}