Add debug logging for mic/audio troubleshooting

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

index.html

@@ -1166,7 +1166,21 @@
                     localStream = await navigator.mediaDevices.getUserMedia({
                         audio: { echoCancellation: true, noiseSuppression: true, autoGainControl: true }
                     });
-                    if (audioSender) await audioSender.replaceTrack(localStream.getAudioTracks()[0]);
+                    console.log('Got mic stream:', localStream.getAudioTracks()[0].label);
+                    console.log('audioSender exists:', !!audioSender);
+                    if (audioSender) {
+                        await audioSender.replaceTrack(localStream.getAudioTracks()[0]);
+                        console.log('Track replaced on sender');
+                        // Log connection state
+                        console.log('PeerConnection state:', peerConnection?.connectionState);
+                        console.log('ICE state:', peerConnection?.iceConnectionState);
+                        // Log all transceivers
+                        peerConnection?.getTransceivers().forEach((t, i) => {
+                            console.log(`Transceiver ${i}: kind=${t.receiver.track?.kind}, direction=${t.direction}, currentDirection=${t.currentDirection}`);
+                        });
+                    } else {
+                        console.error('No audioSender available!');
+                    }
                     micEnabled = true;
                     btn.textContent = 'Disable Mic';
                     btn.classList.remove('btn-primary');