Fix stop bug

sia/web_agent.py

@@ -124,6 +124,8 @@ class WebAgent(BaseAgent):
         if llm_name not in self._llms:
             raise ValueError(f"Unknown LLM: {llm_name}")
         self._stop_flags[llm_name] = True
+        with self._llm_lock:
+            self._set_llm_state(llm_name, LlmState.IDLE)
 
     def approve_response(self) -> None:
         """Process approved response from specified LLM"""