Favorites: remove npub resend tracking and nickname-based key migration; rely on Noise key as identity

bitchat/Services/FavoritesPersistenceService.swift

@@ -13,12 +13,16 @@ final class FavoritesPersistenceService: ObservableObject {
         let theyFavoritedUs: Bool
         let favoritedAt: Date
         let lastUpdated: Date
+        // Track what we last sent as OUR npub to this peer, to avoid resending unless it changes
+        // Note: we do not track which npub we last sent to them; sending happens only on favorite toggle
         
         var isMutual: Bool {
             isFavorite && theyFavoritedUs
         }
     }
     
+    // We intentionally do not track when we last sent our npub; sending happens only on favorite toggle.
+
     private static let storageKey = "chat.bitchat.favorites"
     private static let keychainService = "chat.bitchat.favorites"
     

bitchat/Services/MessageRouter.swift

@@ -74,6 +74,7 @@ final class MessageRouter {
     }
 
     func sendFavoriteNotification(to peerID: String, isFavorite: Bool) {
+        // Route via mesh when connected; else use Nostr
         if mesh.isPeerConnected(peerID) {
             mesh.sendFavoriteNotification(to: peerID, isFavorite: isFavorite)
         } else {

bitchat/Services/UnifiedPeerService.swift

@@ -195,27 +195,6 @@ final class UnifiedPeerService: ObservableObject, TransportPeerEventsDelegate {
            let favoriteStatus = favorites[noiseKey] {
             peer.favoriteStatus = favoriteStatus
             peer.nostrPublicKey = favoriteStatus.peerNostrPublicKey
-        } else {
-            // Check by nickname for reconnected peers
-            let favoriteByNickname = favorites.values.first { 
-                $0.peerNickname == peerInfo.nickname 
-            }
-            
-            if let favorite = favoriteByNickname,
-               let noiseKey = peerInfo.noisePublicKey {
-                SecureLogger.debug("🔄 Found favorite for '\(peerInfo.nickname)' by nickname, updating noise key", category: .session)
-                
-                // Update the favorite's key in persistence
-                favoritesService.updateNoisePublicKey(
-                    from: favorite.peerNoisePublicKey,
-                    to: noiseKey,
-                    peerNickname: peerInfo.nickname
-                )
-                
-                // Get updated favorite
-                peer.favoriteStatus = favoritesService.getFavoriteStatus(for: noiseKey)
-                peer.nostrPublicKey = peer.favoriteStatus?.peerNostrPublicKey ?? favorite.peerNostrPublicKey
-            }
         }
         
         return peer