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/Ui/RetailPositionFormatter.cs

@@ -0,0 +1,31 @@
+using System.Globalization;
+using AcDream.Core.Physics;
+
+namespace AcDream.Core.Ui;
+
+/// <summary>Retail text formatting for world positions and outdoor cells.</summary>
+public static class RetailPositionFormatter
+{
+    /// <summary>
+    /// Verbatim field order and precision from
+    /// <c>Position::ToString @ 0x005A9330</c>.
+    /// </summary>
+    public static string Format(Position position)
+    {
+        var p = position.Frame.Origin;
+        var q = position.Frame.Orientation;
+        return string.Create(CultureInfo.InvariantCulture,
+            $"0x{position.ObjCellId:X8} [{p.X:F6} {p.Y:F6} {p.Z:F6}] " +
+            $"{q.W:F6} {q.X:F6} {q.Y:F6} {q.Z:F6}");
+    }
+
+    /// <summary>
+    /// Port of <c>LandDefs::CellidToCoordinateString @ 0x005A9CB0</c>.
+    /// Returns null for indoor/invalid cells, matching the underlying
+    /// <c>gid_to_lcoord</c> failure.
+    /// </summary>
+    public static string? FormatOutdoorCell(uint cellId) =>
+        RadarCoordinates.TryFromCell(cellId, out var coordinates)
+            ? coordinates.CombinedText
+            : null;
+}