Expose microphone PCM timeout to shared capture consumers

tools/chatgui/src/audio_capture.cpp

@@ -181,3 +181,6 @@ void AudioCapture::recover() { if (m_session) m_session->recover(); }
 bool AudioCapture::running() const {
     return m_session && m_prepared && m_session->device.initialized() && ma_device_is_started(m_session->device.device());
 }
+bool AudioCapture::captureTimedOut() const {
+    return m_session && m_prepared && m_session->device.captureTimedOut();
+}

tools/chatgui/src/audio_capture.h

@@ -35,6 +35,7 @@ public:
     void recover();
     bool subscribed() const { return bool(m_session); }
     bool running() const;
+    bool captureTimedOut() const;
 private:
     struct Session;
     std::shared_ptr<Session> detach();