Improve private message notification behavior

- Don't show PM notifications when the private chat is already open
- Store peer ID in notification userInfo for reliable chat opening
- Tap notification to open the correct private chat using peer ID
- Check both in ChatViewModel (when receiving) and NotificationDelegate (when presenting)

bitchat/BitchatApp.swift

@@ -147,26 +147,38 @@ class NotificationDelegate: NSObject, UNUserNotificationCenterDelegate {
     
     func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
         let identifier = response.notification.request.identifier
+        let userInfo = response.notification.request.content.userInfo
         
         // Check if this is a private message notification
         if identifier.hasPrefix("private-") {
-            // Extract sender from notification title
-            let title = response.notification.request.content.title
-            if let senderName = title.replacingOccurrences(of: "Private message from ", with: "").nilIfEmpty {
-                // Find peer ID and open chat
-                if let peerID = chatViewModel?.getPeerIDForNickname(senderName) {
+            // Get peer ID from userInfo
+            if let peerID = userInfo["peerID"] as? String {
                 DispatchQueue.main.async {
                     self.chatViewModel?.startPrivateChat(with: peerID)
                 }
             }
         }
-        }
         
         completionHandler()
     }
     
     func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
-        // Show notification even when app is in foreground (for testing)
+        let identifier = notification.request.identifier
+        let userInfo = notification.request.content.userInfo
+        
+        // Check if this is a private message notification
+        if identifier.hasPrefix("private-") {
+            // Get peer ID from userInfo
+            if let peerID = userInfo["peerID"] as? String {
+                // Don't show notification if the private chat is already open
+                if chatViewModel?.selectedPrivateChatPeer == peerID {
+                    completionHandler([])
+                    return
+                }
+            }
+        }
+        
+        // Show notification in all other cases
         completionHandler([.banner, .sound])
     }
 }

bitchat/Services/NotificationService.swift

@@ -29,7 +29,7 @@ class NotificationService {
         }
     }
     
-    func sendLocalNotification(title: String, body: String, identifier: String) {
+    func sendLocalNotification(title: String, body: String, identifier: String, userInfo: [String: Any]? = nil) {
         // For now, skip app state check entirely to avoid thread issues
         // The NotificationDelegate will handle foreground presentation
         DispatchQueue.main.async {
@@ -37,6 +37,9 @@ class NotificationService {
             content.title = title
             content.body = body
             content.sound = .default
+            if let userInfo = userInfo {
+                content.userInfo = userInfo
+            }
             
             let request = UNNotificationRequest(
                 identifier: identifier,
@@ -58,12 +61,13 @@ class NotificationService {
         sendLocalNotification(title: title, body: body, identifier: identifier)
     }
     
-    func sendPrivateMessageNotification(from sender: String, message: String) {
+    func sendPrivateMessageNotification(from sender: String, message: String, peerID: String) {
         let title = "🔒 private message from \(sender)"
         let body = message
         let identifier = "private-\(UUID().uuidString)"
+        let userInfo = ["peerID": peerID, "senderName": sender]
         
-        sendLocalNotification(title: title, body: body, identifier: identifier)
+        sendLocalNotification(title: title, body: body, identifier: identifier, userInfo: userInfo)
     }
     
     func sendFavoriteOnlineNotification(nickname: String) {

bitchat/ViewModels/ChatViewModel.swift

@@ -1968,7 +1968,10 @@ extension ChatViewModel: BitchatDelegate {
         if isMentioned && message.sender != nickname {
             NotificationService.shared.sendMentionNotification(from: message.sender, message: message.content)
         } else if message.isPrivate && message.sender != nickname {
-            NotificationService.shared.sendPrivateMessageNotification(from: message.sender, message: message.content)
+            // Only send notification if the private chat is not currently open
+            if selectedPrivateChatPeer != message.senderPeerID {
+                NotificationService.shared.sendPrivateMessageNotification(from: message.sender, message: message.content, peerID: message.senderPeerID ?? "")
+            }
         }
         
         #if os(iOS)