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>

tests/AcDream.Core.Tests/Social/SocialStateTests.cs

@@ -0,0 +1,57 @@
+using AcDream.Core.Social;
+
+namespace AcDream.Core.Tests.Social;
+
+public sealed class SocialStateTests
+{
+    [Fact]
+    public void FriendsState_AppliesRetailIncrementalUpdateKindsByObjectId()
+    {
+        var state = new FriendsState();
+        state.Apply(Update(FriendsUpdateType.Full,
+            Friend(1u, "Alice", online: false),
+            Friend(2u, "Bjørn", online: true)));
+        state.Apply(Update(FriendsUpdateType.OnlineStatus,
+            Friend(1u, "Alice", online: true)));
+        state.Apply(Update(FriendsUpdateType.Add,
+            Friend(3u, "Cara", online: true)));
+        state.Apply(Update(FriendsUpdateType.RemoveSilent,
+            Friend(2u, "Bjørn", online: false)));
+
+        Assert.Collection(
+            state.Snapshot(),
+            alice =>
+            {
+                Assert.Equal(1u, alice.Id);
+                Assert.True(alice.Online);
+            },
+            cara => Assert.Equal(3u, cara.Id));
+    }
+
+    [Fact]
+    public void SquelchState_ReplacesDatabaseAtomically()
+    {
+        var state = new SquelchState();
+        var expected = new SquelchDatabase(
+            new Dictionary<string, uint>(StringComparer.OrdinalIgnoreCase)
+            {
+                ["Account"] = 7u,
+            },
+            new Dictionary<uint, SquelchInfo>
+            {
+                [42u] = new("Character", false, new HashSet<uint> { 2u }),
+            },
+            new SquelchInfo(string.Empty, false, new HashSet<uint> { 7u }));
+
+        state.Replace(expected);
+
+        Assert.Same(expected, state.Snapshot());
+    }
+
+    private static FriendEntry Friend(uint id, string name, bool online) =>
+        new(id, name, online, AppearOffline: false, [], []);
+
+    private static FriendsUpdate Update(
+        FriendsUpdateType type, params FriendEntry[] entries) =>
+        new(type, entries);
+}