stopGeneration method

@override Future<void> stopGeneration()

Stops the in-flight generation both locally (closes the Dart stream) and upstream (calls conversation.cancel() per the @litert-lm/core JS API). The cancel call is wrapped in try/catch because the early-preview API may throw if no generation is in flight.

Implementation

@override
Future<void> stopGeneration() async {
  _isCancelled = true;
  try {
    conversation.cancel();
  } catch (e) {
    if (kDebugMode) {
      debugPrint('[LiteRtLmWebSession] conversation.cancel() threw: $e');
    }
  }
}