saveWorkflow method
Implementation
Future<void> saveWorkflow(PlaygroundWorkflow workflow) async {
final idx = _workflows.indexWhere((w) => w.id == workflow.id);
if (idx >= 0) {
_workflows[idx] = workflow;
} else {
_workflows.add(workflow);
}
_loadedWorkflowId = workflow.id;
await _storage.saveWorkflows(_workflows);
notifyListeners();
}