Remove dead code and simplify codebase

- Remove unused BinaryEncodable protocol and BinaryMessageType enum
- Delete MockNoiseSession.swift (never used in tests)
- Remove all relay detection code (hardcoded to false)
  - Removed isRelayConnected property from BitchatPeer
  - Removed relayConnected case from ConnectionState enum
  - Cleaned up relay-related UI indicators in ContentView
  - Removed relay status checks from ChatViewModel
- Simplified peer connection logic by removing relay layer

Total: 169 lines removed across 5 files

bitchat/Models/BitchatPeer.swift

@@ -18,7 +18,6 @@ struct BitchatPeer: Identifiable, Equatable {
     // Connection state
     enum ConnectionState {
         case bluetoothConnected
-        case relayConnected     // Connected via mesh relay (another peer)
         case nostrAvailable     // Mutual favorite, reachable via Nostr
         case offline            // Not connected via any transport
     }
@@ -26,8 +25,6 @@ struct BitchatPeer: Identifiable, Equatable {
     var connectionState: ConnectionState {
         if isConnected {
             return .bluetoothConnected
-        } else if isRelayConnected {
-            return .relayConnected
         } else if favoriteStatus?.isMutual == true {
             // Mutual favorites can communicate via Nostr when offline
             return .nostrAvailable
@@ -36,8 +33,6 @@ struct BitchatPeer: Identifiable, Equatable {
         }
     }
     
-    var isRelayConnected: Bool = false  // Set by PeerManager based on session state
-    
     var isFavorite: Bool {
         favoriteStatus?.isFavorite ?? false
     }
@@ -59,8 +54,6 @@ struct BitchatPeer: Identifiable, Equatable {
         switch connectionState {
         case .bluetoothConnected:
             return "📻" // Radio icon for mesh connection
-        case .relayConnected:
-            return "🔗" // Chain link for relay connection
         case .nostrAvailable:
             return "🌐" // Purple globe for Nostr
         case .offline:
@@ -78,15 +71,13 @@ struct BitchatPeer: Identifiable, Equatable {
         noisePublicKey: Data,
         nickname: String,
         lastSeen: Date = Date(),
-        isConnected: Bool = false,
-        isRelayConnected: Bool = false
+        isConnected: Bool = false
     ) {
         self.id = id
         self.noisePublicKey = noisePublicKey
         self.nickname = nickname
         self.lastSeen = lastSeen
         self.isConnected = isConnected
-        self.isRelayConnected = isRelayConnected
         
         // Load favorite status - will be set later by the manager
         self.favoriteStatus = nil
@@ -156,28 +147,15 @@ class PeerManager: ObservableObject {
                 continue
             }
             
-            // Check if this peer is actually connected (not just known via relay)
+            // Check if this peer is actually connected
             let isConnected = meshService.isPeerConnected(peerID)
-            let isKnown = meshService.isPeerKnown(peerID)
-            // In a mesh network, a peer can only be relay-connected if:
-            // 1. We know about them (have received announce)
-            // 2. We're not directly connected
-            // 3. There are other peers that could relay (mesh peer count > 2)
-            // For now, disable relay detection until we have proper relay tracking
-            let isRelayConnected = false
-            
-            // Debug logging for relay connection detection
-            if isKnown && !isConnected {
-                SecureLogger.log("Peer \(nickname) (\(peerID)): isConnected=\(isConnected), isKnown=\(isKnown), isRelayConnected=\(isRelayConnected)", 
-                               category: SecureLogger.session, level: .debug)
-            }
             
             // Skip disconnected peers unless they're favorites (handled later)
-            if !isConnected && !isRelayConnected {
+            if !isConnected {
                 continue
             }
             
-            if isConnected || isRelayConnected {
+            if isConnected {
                 connectedNicknames.insert(nickname)
             }
             
@@ -188,8 +166,7 @@ class PeerManager: ObservableObject {
                 id: peerID,
                 noisePublicKey: noiseKey,
                 nickname: nickname,
-                isConnected: isConnected,
-                isRelayConnected: isRelayConnected
+                isConnected: isConnected
             )
             // Set favorite status - check both by current noise key and by nickname
             if let favoriteStatus = favoritesService.getFavoriteStatus(for: noiseKey) {
@@ -211,14 +188,14 @@ class PeerManager: ObservableObject {
             allPeers.append(peer)
         }
         
-        // Add offline favorites (only those not currently connected/relay-connected AND that we actively favorite)
+        // Add offline favorites (only those not currently connected AND that we actively favorite)
         
         for (favoriteKey, favorite) in favoritesService.favorites {
             let favoriteID = favorite.peerNoisePublicKey.hexEncodedString()
             
-            // Skip if this peer is already connected or relay-connected (by nickname)
+            // Skip if this peer is already connected (by nickname)
             if connectedNicknames.contains(favorite.peerNickname) {
-                SecureLogger.log("  - Skipping '\(favorite.peerNickname)' (key: \(favoriteKey.hexEncodedString())) - already connected/relay-connected", 
+                SecureLogger.log("  - Skipping '\(favorite.peerNickname)' (key: \(favoriteKey.hexEncodedString())) - already connected", 
                                 category: SecureLogger.session, level: .debug)
                 continue
             }
@@ -259,16 +236,12 @@ class PeerManager: ObservableObject {
             !(peer.displayName == "Unknown" && peer.favoriteStatus == nil)
         }
         
-        // Sort: Connected first (direct then relay), then favorites, then alphabetical
+        // Sort: Connected first, then favorites, then alphabetical
         allPeers.sort { lhs, rhs in
             // Direct connections first
             if lhs.isConnected != rhs.isConnected {
                 return lhs.isConnected
             }
-            // Then relay connections
-            if lhs.isRelayConnected != rhs.isRelayConnected {
-                return lhs.isRelayConnected
-            }
             // Then favorites
             if lhs.isFavorite != rhs.isFavorite {
                 return lhs.isFavorite
@@ -321,13 +294,10 @@ class PeerManager: ObservableObject {
             
             // Log each peer's status
             for peer in allPeers {
-                // Use the actual statusIcon from the peer which accounts for relay connections
                 let statusIcon: String
                 switch peer.connectionState {
                 case .bluetoothConnected:
                     statusIcon = "🟢"
-                case .relayConnected:
-                    statusIcon = "🔗"
                 case .nostrAvailable:
                     statusIcon = "🌐"
                 case .offline: