Add tap-to-PM and favorite features

- Make sender names tappable in messages to start private chat
- Add star button in private chat header to favorite/unfavorite peers
- Refactor message view to separate timestamp, sender, and content
- Add helper methods for formatting different parts of messages
- Own sender name is not tappable (only other users)
- Voice notes remain tappable to play/pause

bitchat/Services/BluetoothMeshService.swift

@@ -999,7 +999,11 @@ extension BluetoothMeshService: CBPeripheralDelegate {
     }
     
     func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) {
-        // Handle write completion if needed
+        if let error = error {
+            print("[PERIPHERAL] Write failed: \(error)")
+        } else {
+            print("[PERIPHERAL] Write completed successfully")
+        }
     }
     
     func peripheral(_ peripheral: CBPeripheral, didModifyServices invalidatedServices: [CBService]) {