fix: threadId assignment to first user message (#1960)

* fix: threadId assignment to first user message

* applied ruff check --fix and ruff format

Author: Dan-data-tech

backend/chainlit/data/sql_alchemy.py

@@ -345,6 +345,8 @@ async def list_threads(
     ###### Steps ######
     @queue_until_user_message()
     async def create_step(self, step_dict: "StepDict"):
+        await self.update_thread(step_dict["threadId"])
+
         if self.show_logger:
             logger.info(f"SQLAlchemy: create_step, step_id={step_dict.get('id')}")