Improve call buffering, CM handle lifecycle and radio PTT controls

tools/chatgui/src/mainwindow.cpp

@@ -456,6 +456,12 @@ void MainWindow::setupBridgeCallbacks() {
         Q_UNUSED(text); Q_UNUSED(len);
         if (s_mainWindow) s_mainWindow->onCallError(call_id, err);
     });
+    gui_bridge_set_call_stats_cb([](uint64_t id, int rtt, int buffer, int tempo, int dropped,
+                                    int underruns, int minimum, int maximum, int reserve) {
+        if (!s_mainWindow) return;
+        auto* w = s_mainWindow->m_activeCalls.value(id, nullptr);
+        if (w) w->setAudioStats(rtt, buffer, tempo, dropped, underruns, minimum, maximum, reserve);
+    });
     gui_bridge_set_call_path_cb([](uint64_t call_id, const char* text, int len) {
         if (s_mainWindow) s_mainWindow->onCallPath(call_id, QString::fromUtf8(text, len));
     });