feat: mcp sleep

main/application.h

@@ -140,6 +140,10 @@ private:
     bool aborted_ = false;
     bool assets_version_checked_ = false;
     bool play_popup_on_listening_ = false;  // Flag to play popup sound after state changes to listening
+    bool fatigue_reminder_triggered_in_listening_ = false;
+    int fatigue_silence_seconds_ = 0;
+    int fatigue_idle_seconds_ = 0;
+    int64_t last_fatigue_reminder_time_us_ = 0;
     int clock_ticks_ = 0;
     TaskHandle_t activation_task_handle_ = nullptr;
 
@@ -155,6 +159,8 @@ private:
     void HandleWakeWordDetectedEvent();
     void ContinueOpenAudioChannel(ListeningMode mode);
     void ContinueWakeWordInvoke(const std::string& wake_word);
+    void CheckFatigueReminder();
+    void TriggerFatigueReminder();
 
     // Activation task (runs in background)
     void ActivationTask();