fix(web): avoid clearing assistant content before saving

web_server.py

@@ -3013,12 +3013,6 @@ async def handle_task_with_sender(terminal: WebTerminal, message, sender, client
                 'content': f'⚠️ 追加写入失败：{append_result.get("error")}'
             })
         
-        # 重置文本流状态，避免后续错误处理
-        text_streaming = False
-        text_started = False
-        text_has_content = False
-        full_response = ""
-        
         if modify_result["handled"]:
             modify_metadata = modify_result.get("assistant_metadata")
             modify_content_text = modify_result.get("assistant_content")