Expose desktop output latency and verify hardware clock transitions

tools/chatgui/src/call_audio_engine.h

@@ -33,6 +33,7 @@ public:
 
     bool isActive() const { return m_active.load(); }
     quint64 callId() const { return m_callId.load(); }
+    VoiceAudioIo::OutputLatency outputLatency() const { return m_voice.outputLatency(); }
 
     /* Mute: пир слышит тишину (отправляем нулевые кадры вместо захваченного PCM). */
     void setMuted(bool muted);

tools/chatgui/src/callwindow.cpp

@@ -506,10 +506,20 @@ void CallWindow::updateDuration() {
 
 void CallWindow::setAudioStats(int rtt, int buffer, int tempo, int dropped, int underruns,
                               int minimum, int maximum, int reserve) {
-    m_statsLabel->setText(QCoreApplication::translate("ChatGui",
+    QString text = QCoreApplication::translate("ChatGui",
         "Buffer: %1 ms · Reserve: %2 ms\nOver 10 s: minimum %3 · maximum %4 ms\nSpeed: %5× · RTT: %6 "
         "ms\nBuffer drops: %7 · Underruns: %8")
         .arg(buffer).arg(reserve).arg(minimum).arg(maximum)
-        .arg(tempo / 100.0, 0, 'f', 2).arg(rtt).arg(dropped).arg(underruns));
+        .arg(tempo / 100.0, 0, 'f', 2).arg(rtt).arg(dropped).arg(underruns);
+    auto* audio = CallAudioEngine::instance();
+    if (audio->callId() == m_callId) {
+        auto output = audio->outputLatency();
+        auto value = [](int ms) { return ms >= 0 ? QString::number(ms) : QStringLiteral("—"); };
+        QString total = value(output.outputMs);
+        if (output.outputMs >= 0 && !output.measured) total.prepend(QStringLiteral("~"));
+        text += QLatin1Char('\n') + QCoreApplication::translate("ChatGui", "Audio output: %1 ms (includes app queue: %2 ms)")
+            .arg(total).arg(value(output.queueMs));
+    }
+    m_statsLabel->setText(text);
     m_statsLabel->setVisible(m_state == Active);
 }