Refactor audio channel handling and wake word detection in Application class (#1722)

- Introduced ContinueOpenAudioChannel and ContinueWakeWordInvoke methods to streamline audio channel management and wake word processing.
- Updated HandleToggleChatEvent and HandleWakeWordDetectedEvent to utilize scheduling for state changes, improving UI responsiveness.
- Simplified logic for setting listening modes based on audio channel state, enhancing code clarity and maintainability.

main/application.h

@@ -153,6 +153,8 @@ private:
     void HandleNetworkDisconnectedEvent();
     void HandleActivationDoneEvent();
     void HandleWakeWordDetectedEvent();
+    void ContinueOpenAudioChannel(ListeningMode mode);
+    void ContinueWakeWordInvoke(const std::string& wake_word);
 
     // Activation task (runs in background)
     void ActivationTask();