Trim whitespace from nicknames to prevent display issues

- Added didSet observer to nickname property to trim on every change
- Trim nickname when loading from UserDefaults
- Update validateAndSaveNickname to properly trim
- Trim received nicknames in announce packets
- Add custom init/decoder for NoiseIdentityAnnouncement to ensure trimming
- Trim nicknames when decoding from binary data

bitchat/Protocols/BitchatProtocol.swift

@@ -654,12 +654,27 @@ struct NoiseIdentityAnnouncement: Codable {
         self.peerID = peerID
         self.publicKey = publicKey
         self.signingPublicKey = signingPublicKey
-        self.nickname = nickname
+        // Trim whitespace from nickname
+        self.nickname = nickname.trimmingCharacters(in: .whitespacesAndNewlines)
         self.timestamp = timestamp
         self.previousPeerID = previousPeerID
         self.signature = signature
     }
     
+    // Custom decoder to ensure nickname is trimmed
+    init(from decoder: Decoder) throws {
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        self.peerID = try container.decode(String.self, forKey: .peerID)
+        self.publicKey = try container.decode(Data.self, forKey: .publicKey)
+        self.signingPublicKey = try container.decode(Data.self, forKey: .signingPublicKey)
+        // Trim whitespace from decoded nickname
+        let rawNickname = try container.decode(String.self, forKey: .nickname)
+        self.nickname = rawNickname.trimmingCharacters(in: .whitespacesAndNewlines)
+        self.timestamp = try container.decode(Date.self, forKey: .timestamp)
+        self.previousPeerID = try container.decodeIfPresent(String.self, forKey: .previousPeerID)
+        self.signature = try container.decode(Data.self, forKey: .signature)
+    }
+    
     func encode() -> Data? {
         return try? JSONEncoder().encode(self)
     }
@@ -738,9 +753,12 @@ struct NoiseIdentityAnnouncement: Codable {
         
         guard let publicKey = dataCopy.readData(at: &offset),
               let signingPublicKey = dataCopy.readData(at: &offset),
-              let nickname = dataCopy.readString(at: &offset),
+              let rawNickname = dataCopy.readString(at: &offset),
               let timestamp = dataCopy.readDate(at: &offset) else { return nil }
         
+        // Trim whitespace from nickname
+        let nickname = rawNickname.trimmingCharacters(in: .whitespacesAndNewlines)
+        
         var previousPeerID: String? = nil
         if hasPreviousPeerID {
             // Read previousPeerID using safe method

bitchat/Services/BluetoothMeshService.swift

@@ -2592,7 +2592,9 @@ class BluetoothMeshService: NSObject {
         // Note: 0x02 was legacy keyExchange - removed
             
         case .announce:
-            if let nickname = String(data: packet.payload, encoding: .utf8) {
+            if let rawNickname = String(data: packet.payload, encoding: .utf8) {
+                // Trim whitespace from received nickname
+                let nickname = rawNickname.trimmingCharacters(in: .whitespacesAndNewlines)
                 let senderID = packet.senderID.hexEncodedString()
                 
                 SecureLogger.log("handleReceivedPacket: Received announce from \(senderID), peripheral is \(peripheral != nil ? "present" : "nil")", category: SecureLogger.session, level: .debug)

bitchat/ViewModels/ChatViewModel.swift

@@ -25,7 +25,15 @@ class ChatViewModel: ObservableObject {
     private var pendingPrivateMessages: [String: [BitchatMessage]] = [:] // peerID -> messages
     private var messageBatchTimer: Timer?
     private let messageBatchInterval: TimeInterval = 0.1 // 100ms batching window
-    @Published var nickname: String = ""
+    @Published var nickname: String = "" {
+        didSet {
+            // Trim whitespace whenever nickname is set
+            let trimmed = nickname.trimmingCharacters(in: .whitespacesAndNewlines)
+            if trimmed != nickname {
+                nickname = trimmed
+            }
+        }
+    }
     @Published var isConnected = false
     @Published var privateChats: [String: [BitchatMessage]] = [:] // peerID -> messages
     @Published var selectedPrivateChatPeer: String? = nil
@@ -176,7 +184,8 @@ class ChatViewModel: ObservableObject {
     
     private func loadNickname() {
         if let savedNickname = userDefaults.string(forKey: nicknameKey) {
-            nickname = savedNickname
+            // Trim whitespace when loading
+            nickname = savedNickname.trimmingCharacters(in: .whitespacesAndNewlines)
         } else {
             nickname = "anon\(Int.random(in: 1000...9999))"
             saveNickname()
@@ -192,9 +201,14 @@ class ChatViewModel: ObservableObject {
     }
     
     func validateAndSaveNickname() {
-        // Check if nickname is empty or just whitespace
-        if nickname.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
+        // Trim whitespace from nickname
+        let trimmed = nickname.trimmingCharacters(in: .whitespacesAndNewlines)
+        
+        // Check if nickname is empty after trimming
+        if trimmed.isEmpty {
             nickname = "anon\(Int.random(in: 1000...9999))"
+        } else {
+            nickname = trimmed
         }
         saveNickname()
     }