fix(ui): port exact paperdoll body selection

Resolve and sample retail's authored nine-color paperdoll click map, preserve local click coordinates, and select the stable highest-priority worn item with the player fallback. Keep targeted-use body clicks routed to self and pin both synthetic and live-DAT conformance.

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

tests/AcDream.App.Tests/UI/UiButtonTests.cs

@@ -16,6 +16,20 @@ public class UiButtonTests
         Assert.True(_clicked);
     }
 
+    [Fact]
+    public void Click_ProvidesLocalCoordinatesToPositionAwareHandler()
+    {
+        (int X, int Y) clicked = default;
+        var b = new UiButton(new ElementInfo { Type = 1, Width = 46, Height = 18 }, NoTex)
+        {
+            OnClickAt = (x, y) => clicked = (x, y),
+        };
+
+        b.OnEvent(new UiEvent(0, b, UiEventType.Click, Data1: 17, Data2: 9));
+
+        Assert.Equal((17, 9), clicked);
+    }
+
     [Fact]
     public void NotClickThrough_SoItReceivesClicks()
     {