Fix deadlock in DeliveryTracker causing macOS app freeze

- Fixed nested lock acquisition in trackMessage/scheduleTimeout
- Properly handle lock release before calling methods that need locks
- Ensure retryDelivery and handleTimeout don't cause deadlocks
- Release locks before calling external methods

bitchat/Info.plist

@@ -26,7 +26,19 @@
 	<string>bitchat uses Bluetooth to create a secure mesh network for chatting with nearby users.</string>
 	<key>NSBluetoothPeripheralUsageDescription</key>
 	<string>bitchat uses Bluetooth to discover and connect with other bitchat users nearby.</string>
-	<key>NSUserNotificationAlertStyle</key>
-	<string>alert</string>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>bluetooth-central</string>
+		<string>bluetooth-peripheral</string>
+	</array>
+	<key>UILaunchScreen</key>
+	<dict>
+		<key>UIColorName</key>
+		<string>Black</string>
+	</dict>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+	</array>
 </dict>
 </plist>