优化决策后时间戳更新逻辑，确保新消息判断的准确性

src/chat/planner_actions/planner.py

@@ -257,6 +257,9 @@ class ActionPlanner:
             "is_parallel": is_parallel,
         }
 
+        # 只有在成功完成决策后才更新已读时间戳，确保新消息判断的准确性
+        self.last_obs_time_mark = time.time()
+
         return (
             {
                 "action_result": action_result,
@@ -301,7 +304,7 @@ class ActionPlanner:
 
             actions_before_now_block = f"你刚刚选择并执行过的action是：\n{actions_before_now_block}"
 
-            self.last_obs_time_mark = time.time()
+            # 注意：不在这里更新last_obs_time_mark，应该在plan成功后再更新，避免异常情况下错误更新时间戳
 
             if mode == ChatMode.FOCUS:
                 mentioned_bonus = ""