feat(chat): port retail client command families

Expand the typed client-command boundary across travel, character queries, local UI and layout controls, AFK and consent, emotes, friends, squelch and filters, and fill-components. Preserve retail packet layouts and queue ownership, import the confirmation dialog, and keep authoritative social state in Core.

Co-Authored-By: Codex <codex@openai.com>

src/AcDream.Core/Social/FriendsState.cs

@@ -0,0 +1,74 @@
+namespace AcDream.Core.Social;
+
+/// <summary>Authoritative client-side copy of retail's <c>FriendDataList</c>.</summary>
+public sealed class FriendsState
+{
+    private readonly object _gate = new();
+    private readonly List<FriendEntry> _entries = new();
+
+    public IReadOnlyList<FriendEntry> Snapshot()
+    {
+        lock (_gate) return _entries.ToArray();
+    }
+
+    public void Apply(FriendsUpdate update)
+    {
+        ArgumentNullException.ThrowIfNull(update);
+        lock (_gate)
+        {
+            switch (update.Type)
+            {
+                case FriendsUpdateType.Full:
+                    _entries.Clear();
+                    _entries.AddRange(update.Entries);
+                    break;
+                case FriendsUpdateType.Add:
+                    foreach (FriendEntry entry in update.Entries)
+                    {
+                        int index = _entries.FindIndex(candidate => candidate.Id == entry.Id);
+                        if (index >= 0) _entries[index] = entry;
+                        else _entries.Add(entry);
+                    }
+                    break;
+                case FriendsUpdateType.Remove:
+                case FriendsUpdateType.RemoveSilent:
+                    foreach (FriendEntry entry in update.Entries)
+                        _entries.RemoveAll(candidate => candidate.Id == entry.Id);
+                    break;
+                case FriendsUpdateType.OnlineStatus:
+                    foreach (FriendEntry entry in update.Entries)
+                    {
+                        int index = _entries.FindIndex(candidate => candidate.Id == entry.Id);
+                        if (index >= 0) _entries[index] = entry;
+                    }
+                    break;
+            }
+        }
+    }
+
+    public void Clear()
+    {
+        lock (_gate) _entries.Clear();
+    }
+}
+
+public sealed record FriendEntry(
+    uint Id,
+    string Name,
+    bool Online,
+    bool AppearOffline,
+    IReadOnlyList<uint> Friends,
+    IReadOnlyList<uint> FriendOf);
+
+public enum FriendsUpdateType : uint
+{
+    Full = 0,
+    Add = 1,
+    Remove = 2,
+    RemoveSilent = 3,
+    OnlineStatus = 4,
+}
+
+public sealed record FriendsUpdate(
+    FriendsUpdateType Type,
+    IReadOnlyList<FriendEntry> Entries);

src/AcDream.Core/Social/SquelchState.cs

@@ -0,0 +1,35 @@
+namespace AcDream.Core.Social;
+
+/// <summary>Authoritative copy of retail's server-supplied <c>SquelchDB</c>.</summary>
+public sealed class SquelchState
+{
+    private readonly object _gate = new();
+    private SquelchDatabase _database = SquelchDatabase.Empty;
+
+    public SquelchDatabase Snapshot()
+    {
+        lock (_gate) return _database;
+    }
+
+    public void Replace(SquelchDatabase database)
+    {
+        ArgumentNullException.ThrowIfNull(database);
+        lock (_gate) _database = database;
+    }
+}
+
+public sealed record SquelchInfo(
+    string Name,
+    bool AccountWide,
+    IReadOnlySet<uint> MessageTypes);
+
+public sealed record SquelchDatabase(
+    IReadOnlyDictionary<string, uint> Accounts,
+    IReadOnlyDictionary<uint, SquelchInfo> Characters,
+    SquelchInfo Global)
+{
+    public static SquelchDatabase Empty { get; } = new(
+        new Dictionary<string, uint>(StringComparer.OrdinalIgnoreCase),
+        new Dictionary<uint, SquelchInfo>(),
+        new SquelchInfo(string.Empty, false, new HashSet<uint>()));
+}