Fix lazy handshake behavior and re-enable cover traffic (#323)

* Add encryption export compliance to Info.plist

Set ITSAppUsesNonExemptEncryption to false for TestFlight submission

* Revert "Add encryption export compliance to Info.plist"

This reverts commit 2cfbb1679d.

* fix: prevent spurious handshake requests from rotated peers and cover traffic

- Clean up connection states and pending messages during peer ID rotation
- Filter out rotated peer IDs in keep-alive timer to prevent validation attempts
- Add session check before sending cover traffic dummy messages
- Disable cover traffic by default (was sending without user knowledge)
- Only send screenshot notifications when session exists
- Add logging to track automatic message triggers
- Fix compilation errors (SecureLogger.privacy -> security)

* Fix lazy handshake behavior and re-enable cover traffic

- Re-enable cover traffic for privacy protection
- Start handshake immediately when opening PM conversation
- Remove handshake request system notifications

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Co-authored-by: jack <jackjackbits@users.noreply.github.com>

bitchat/ViewModels/ChatViewModel.swift

@@ -610,8 +610,17 @@ class ChatViewModel: ObservableObject {
         if let peerID = selectedPrivateChatPeer {
             // In private chat - send to the other person
             if let peerNickname = meshService.getPeerNicknames()[peerID] {
-                // Send the message directly without going through sendPrivateMessage to avoid local echo
-                meshService.sendPrivateMessage(screenshotMessage, to: peerID, recipientNickname: peerNickname)
+                // Only send screenshot notification if we have an established session
+                // This prevents triggering handshake requests for screenshot notifications
+                let sessionState = meshService.getNoiseSessionState(for: peerID)
+                switch sessionState {
+                case .established:
+                    // Send the message directly without going through sendPrivateMessage to avoid local echo
+                    meshService.sendPrivateMessage(screenshotMessage, to: peerID, recipientNickname: peerNickname)
+                default:
+                    // Don't send screenshot notification if no session exists
+                    SecureLogger.log("Skipping screenshot notification to \(peerID) - no established session", category: SecureLogger.security, level: .debug)
+                }
             }
             
             // Show local notification immediately as system message