Fix message display and add voice note debugging

- Fix escaped backslashes in timestamp and sender name display
- Add comprehensive logging for voice note transmission pipeline
- Add peripheral write completion logging
- Track broadcast success/failure for central updates
- Log audio recorder creation and preparation steps
- Better diagnostics for troubleshooting voice note issues

bitchat/ViewModels/ChatViewModel.swift

@@ -631,6 +631,8 @@ extension ChatViewModel: BitchatDelegate {
     }
     
     func sendVoiceNote(_ audioData: Data, duration: TimeInterval) {
+        print("[VIEWMODEL] sendVoiceNote called with audio data: \(audioData.count) bytes, duration: \(duration)s")
+        
         let message = BitchatMessage(
             sender: nickname,
             content: "🎤 \(String(format: "%.1f", duration))s",
@@ -642,6 +644,8 @@ extension ChatViewModel: BitchatDelegate {
         )
         messages.append(message)
         
+        print("[VIEWMODEL] Added voice note to local messages, sending via mesh...")
+        
         // Send via mesh
         meshService.sendVoiceNote(audioData, duration: duration)
     }