Chat sounds, message card UI, own-message detection, and crash fix

Sounds:
- Add chat sounds (global, map, DM) converted from game client ogg to caf
- Audio category .ambient (mixes with other audio, respects silent switch)
- Per-buffer sound toggles and background buffer sound option in Settings

Messages:
- Card-style message rows with .regularMaterial background, bumped fonts (content .title3, sender .headline)
- Context menu and VoiceOver actions: DM and Show Profile on other players' messages
- Generate local UUIDs for message identity (server ID field is not unique, caused ForEach to collapse messages)

Own-message detection:
- Capture player entity ID from LoadInstance packet (Key 1) on game join
- Hide DM/Profile actions on own messages via senderId comparison

Crash fix:
- Guard all UInt64 timestamp subtractions against underflow (retransmitPending, ping, disconnect timeout)

KDChat/KDChatApp.swift

@@ -4,6 +4,10 @@ import SwiftUI
 struct KDChatApp: App {
     @State private var connectionManager = ConnectionManager()
 
+    init() {
+        SoundPlayer.configureSession()
+    }
+
     var body: some Scene {
         WindowGroup {
             ContentView()

KDChat/Models/ChatModels.swift

@@ -47,8 +47,8 @@ struct ChatMessage: Identifiable, Sendable, Decodable {
     init(from decoder: Decoder) throws {
         var c = try decoder.unkeyedContainer()
         buffer = try c.decode(String.self)                                          // [0]
-        let rawId: String? = try c.decodeNil() ? nil : c.decode(String.self)        // [1]
+        _ = try c.decodeNil() ? nil : c.decode(String.self)                          // [1] server msg ID (not unique)
-        id = rawId ?? UUID().uuidString
+        id = UUID().uuidString
         senderId = try c.decodeNil() ? nil : c.decode(String.self)                  // [2]
         senderName = try c.decode(String.self)                                      // [3]
         isInteractable = try c.decode(Bool.self)                                    // [4]

KDChat/Networking/LiteNetLib.swift

@@ -276,7 +276,7 @@ actor LNLClient {
 
         switch state {
         case .connecting:
-            if now - lastConnectSendTime > 500 {
+            if now >= lastConnectSendTime, now - lastConnectSendTime > 500 {
                 connectAttempts += 1
                 lnlLog.info("ConnectRequest attempt \(self.connectAttempts)/\(self.maxConnectAttempts)")
                 if connectAttempts > maxConnectAttempts {
@@ -288,7 +288,7 @@ actor LNLClient {
             }
 
         case .connected:
-            if now - lastPacketReceivedTime > UInt64(LNL.disconnectTimeoutMs) {
+            if now >= lastPacketReceivedTime, now - lastPacketReceivedTime > UInt64(LNL.disconnectTimeoutMs) {
                 performDisconnect(reason: "Connection timed out")
                 return
             }
@@ -298,7 +298,7 @@ actor LNLClient {
                 sendAck()
                 mustSendAcks = false
             }
-            if now - lastPingSentTime > UInt64(LNL.pingIntervalMs) {
+            if now >= lastPingSentTime, now - lastPingSentTime > UInt64(LNL.pingIntervalMs) {
                 sendPing()
             }
 
@@ -522,7 +522,7 @@ actor LNLClient {
         while seq != localSequence {
             let idx = Int(seq) % LNL.windowSize
             if let pending = pendingPackets[idx] {
-                if Double(now - pending.timestamp) >= resendDelay {
+                if now >= pending.timestamp, Double(now - pending.timestamp) >= resendDelay {
                     pendingPackets[idx]?.timestamp = now
                     sendRaw(pending.data)
                 }
@@ -615,7 +615,9 @@ actor LNLClient {
 
     private func handlePong(_ data: Data) {
         guard data.count >= 3 else { return }
-        let elapsed = Double(currentMs() - pingSentTimestamp)
+        let now = currentMs()
+        guard now >= pingSentTimestamp else { return }
+        let elapsed = Double(now - pingSentTimestamp)
         rttSum += elapsed
         rttCount += 1
         avgRtt = rttSum / Double(rttCount)

KDChat/Networking/ProtocolTypes.swift

@@ -29,7 +29,8 @@ enum ClientMethod: Int32 {
     // 7 = TimeSync (unhandled)
     // 8 = Profile (unhandled)
     case say = 9
-    // 10..32 = game-specific methods (unhandled)
+    case loadInstance = 10
+    // 11..32 = game-specific methods (unhandled)
     case showRemoteForm = 33
     case updateRemoteForm = 34
     case closeRemoteForm = 35

KDChat/Services/ConnectionManager.swift

@@ -2,6 +2,12 @@ import Foundation
 import SwiftUI
 import os
 
+private extension UserDefaults {
+    func bool(forKey key: String, default defaultValue: Bool) -> Bool {
+        object(forKey: key) == nil ? defaultValue : bool(forKey: key)
+    }
+}
+
 private let log = Logger(subsystem: "dev.smoll.KDChat", category: "Connection")
 
 // MARK: - App Screen
@@ -38,10 +44,14 @@ final class ConnectionManager {
     var buffers: [ChatBuffer] = []
     var messages: [String: [ChatMessage]] = [:]
     var currentCharacterId: String?
+    var localSenderId: String?
 
     // Feedback triggers (views observe these for sensoryFeedback / announcements)
     var messageFeedbackTrigger: Int = 0
     var systemFeedbackTrigger: Int = 0
+
+    // Tracks which buffer the user is viewing (set by ChatView)
+    var activeBuffer: String = "global"
     var lastAnnouncement: String = ""
 
     // Auth
@@ -239,6 +249,12 @@ final class ConnectionManager {
         case .addMessage:
             guard let message = PacketDecoder.decode(ChatMessage.self, from: payload) else { return }
             handleAddMessage(message)
+        case .loadInstance:
+            if let value = PacketDecoder.decodeDynamic(from: payload),
+               let entityId = value[1]?.stringValue {
+                localSenderId = entityId
+                log.info("Local entity ID: \(entityId)")
+            }
         case .requestGameplay:
             handleRequestGameplay()
         case .leaveGameUpdate:
@@ -329,6 +345,7 @@ final class ConnectionManager {
 
         messageFeedbackTrigger += 1
         lastAnnouncement = "\(message.senderName): \(message.content)"
+        playMessageSound(buffer: message.buffer)
     }
 
     private func handleSay(_ say: ServerSay) {
@@ -342,6 +359,29 @@ final class ConnectionManager {
         lastAnnouncement = say.message
     }
 
+    private func playMessageSound(buffer: String) {
+        guard UserDefaults.standard.bool(forKey: "sounds_enabled", default: true) else { return }
+
+        let isActiveBuffer = buffer == activeBuffer
+        if !isActiveBuffer {
+            guard UserDefaults.standard.bool(forKey: "sounds_background_buffers", default: true) else { return }
+        }
+
+        switch buffer {
+        case "global":
+            guard UserDefaults.standard.bool(forKey: "sounds_global", default: true) else { return }
+            SoundPlayer.play("global")
+        case "map":
+            guard UserDefaults.standard.bool(forKey: "sounds_map", default: true) else { return }
+            SoundPlayer.play("map")
+        case "direct-messages":
+            guard UserDefaults.standard.bool(forKey: "sounds_dm", default: true) else { return }
+            SoundPlayer.play("direct-message")
+        default:
+            break
+        }
+    }
+
     // MARK: - Game State Handlers
 
     private func handleRequestGameplay() {

KDChat/Services/SoundPlayer.swift

@@ -0,0 +1,36 @@
+import AVFoundation
+import os
+
+private let soundLog = Logger(subsystem: "dev.smoll.KDChat", category: "Sound")
+
+enum SoundPlayer {
+    private static var players: [String: AVAudioPlayer] = [:]
+
+    static func play(_ name: String) {
+        if let cached = players[name] {
+            cached.currentTime = 0
+            cached.play()
+            return
+        }
+        guard let url = Bundle.main.url(forResource: name, withExtension: "caf") else {
+            soundLog.warning("Sound not found: \(name).caf")
+            return
+        }
+        do {
+            let player = try AVAudioPlayer(contentsOf: url)
+            player.prepareToPlay()
+            player.play()
+            players[name] = player
+        } catch {
+            soundLog.error("Failed to play \(name): \(error.localizedDescription)")
+        }
+    }
+
+    static func configureSession() {
+        do {
+            try AVAudioSession.sharedInstance().setCategory(.ambient, mode: .default)
+        } catch {
+            soundLog.error("Failed to configure audio session: \(error.localizedDescription)")
+        }
+    }
+}

KDChat/Views/ChatBufferView.swift

@@ -15,13 +15,11 @@ struct ChatBufferView: View {
         VStack(spacing: 0) {
             ScrollViewReader { proxy in
                 ScrollView {
-                    LazyVStack(alignment: .leading, spacing: 8) {
+                    LazyVStack(alignment: .leading, spacing: 12) {
                         ForEach(messages) { message in
                             MessageRow(
                                 message: message,
-                                onTapSender: message.isInteractable ? { startDM(to: message) } : nil,
+                                onDM: onDM
-                                onDM: onDM,
-                                onProfile: nil // TODO: profile viewing
                             )
                             .id(message.id)
                         }
@@ -77,8 +75,4 @@ struct ChatBufferView: View {
         messageText = ""
     }
 
-    private func startDM(to message: ChatMessage) {
-        guard message.senderId != nil else { return }
-        // Full DM flow would use sendDirectMessage with a selected recipient
-    }
 }

KDChat/Views/ChatView.swift

@@ -55,6 +55,9 @@ struct ChatView: View {
             .onChange(of: manager.lastAnnouncement) {
                 AccessibilityNotification.Announcement(manager.lastAnnouncement).post()
             }
+            .onChange(of: selectedBuffer) {
+                manager.activeBuffer = selectedBuffer
+            }
         }
     }
 

KDChat/Views/MessageRow.swift

@@ -2,59 +2,67 @@ import SwiftUI
 
 struct MessageRow: View {
     let message: ChatMessage
-    var onTapSender: (() -> Void)?
     var onDM: ((ChatMessage) -> Void)?
     var onProfile: ((ChatMessage) -> Void)?
+    @Environment(ConnectionManager.self) private var manager
+
+    private var isOwnMessage: Bool {
+        message.senderIsRecipient || message.senderId == manager.localSenderId
+    }
 
     var body: some View {
         if message.isSystem {
             Text(message.content)
-                .font(.subheadline)
+                .font(.body)
                 .foregroundStyle(.secondary)
                 .italic()
                 .frame(maxWidth: .infinity, alignment: .center)
-                .padding(.vertical, 4)
+                .padding(.vertical, 6)
-        } else {
-            VStack(alignment: .leading, spacing: 6) {
-                HStack(spacing: 4) {
-                    if let tap = onTapSender {
-                        Button(message.senderName, action: tap)
-                            .font(.subheadline).bold()
-                            .accessibilityHint("Tap to send a direct message")
         } else {
+            VStack(alignment: .leading, spacing: 8) {
+                HStack {
                     Text(message.senderName)
-                            .font(.subheadline).bold()
+                        .font(.headline)
                         .foregroundStyle(Color.accentColor)
-                    }
 
                     if message.senderIsRecipient {
                         Text("(you)")
-                            .font(.caption)
+                            .font(.subheadline)
                             .foregroundStyle(.secondary)
                     }
 
                     Spacer()
 
                     Text(message.timestamp, style: .time)
-                        .font(.caption)
+                        .font(.subheadline)
                         .foregroundStyle(.secondary)
                 }
 
                 Text(message.content)
-                    .font(.body)
+                    .font(.title3)
             }
-            .padding(.horizontal, 10)
+            .padding(.horizontal, 12)
-            .padding(.vertical, 8)
+            .padding(.vertical, 10)
             .background(.regularMaterial)
             .clipShape(.rect(cornerRadius: 12))
+            .contextMenu {
+                if !isOwnMessage, message.senderId != nil {
+                    if let onDM {
+                        Button("DM \(message.senderName)", systemImage: "envelope") { onDM(message) }
+                    }
+                    if let onProfile {
+                        Button("Show \(message.senderName)'s Profile", systemImage: "person.circle") { onProfile(message) }
+                    }
+                }
+            }
             .accessibilityElement(children: .combine)
             .accessibilityActions {
-                if !message.senderIsRecipient, message.senderId != nil {
+                if !isOwnMessage, message.senderId != nil {
                     if let onDM {
                         Button("DM \(message.senderName)") { onDM(message) }
                     }
                     if let onProfile {
-                        Button("Profile for \(message.senderName)") { onProfile(message) }
+                        Button("Show \(message.senderName)'s Profile") { onProfile(message) }
                     }
                 }
             }

KDChat/Views/SettingsView.swift

@@ -4,9 +4,26 @@ struct SettingsView: View {
     @AppStorage("haptics_enabled") private var hapticsEnabled = true
     @AppStorage("haptics_messages") private var messageHaptics = true
     @AppStorage("haptics_status") private var statusHaptics = true
+    @AppStorage("sounds_enabled") private var soundsEnabled = true
+    @AppStorage("sounds_global") private var globalSound = true
+    @AppStorage("sounds_map") private var mapSound = true
+    @AppStorage("sounds_dm") private var dmSound = true
+    @AppStorage("sounds_background_buffers") private var backgroundBufferSounds = true
 
     var body: some View {
         Form {
+            Section("Sounds") {
+                Toggle("Sounds", isOn: $soundsEnabled)
+                Toggle("Global Chat", isOn: $globalSound)
+                    .disabled(!soundsEnabled)
+                Toggle("Map Chat", isOn: $mapSound)
+                    .disabled(!soundsEnabled)
+                Toggle("Direct Messages", isOn: $dmSound)
+                    .disabled(!soundsEnabled)
+                Toggle("Other Buffers", isOn: $backgroundBufferSounds)
+                    .disabled(!soundsEnabled)
+            }
+
             Section("Haptics") {
                 Toggle("Haptics", isOn: $hapticsEnabled)
                 Toggle("Message Haptics", isOn: $messageHaptics)