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/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>()));
+}