fix: py style and unittest

api/services/workflow_collaboration_service.py

@@ -81,6 +81,7 @@ class WorkflowCollaborationService:
 
         if event_type == "sync_request":
             leader_sid = self._repository.get_current_leader(workflow_id)
+            target_sid: str | None
             if leader_sid and self.is_session_active(workflow_id, leader_sid):
                 target_sid = leader_sid
             else:

api/tests/unit_tests/services/test_workflow_comment_service.py

@@ -61,6 +61,7 @@ class TestWorkflowCommentService:
             mentioned_user_ids=["user-2"],
             content="hello",
         )
+        expected_app_url = f"{service_module.dify_config.CONSOLE_WEB_URL.rstrip('/')}/app/app-1/workflow"
 
         assert payloads == [
             {
@@ -70,6 +71,7 @@ class TestWorkflowCommentService:
                 "commenter_name": "Commenter",
                 "app_name": "My App",
                 "comment_content": "hello",
+                "app_url": expected_app_url,
             }
         ]