fix(ui): port retail window control feedback

Map synthetic move and resize affordances to the exact DAT cursors, make chat top chrome movable, and replace stale primary-panel height caps with a dynamic screen-edge constraint. This keeps the retained wrapper adaptation aligned with retail Dragbar/Resizebar behavior.

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

@@ -118,6 +118,30 @@ public sealed class RetailWindowManagerTests
         Assert.Equal(1, resized);
     }
 
+    [Fact]
+    public void ProgrammaticResize_ConstrainedToParent_UsesCurrentWindowPosition()
+    {
+        var root = new UiRoot { Width = 800, Height = 600 };
+        var frame = new UiPanel
+        {
+            Left = 40,
+            Top = 125,
+            Width = 300,
+            Height = 200,
+            ResizeX = false,
+            ResizeY = true,
+            ConstrainResizeToParent = true,
+            MinHeight = 100,
+        };
+        root.AddChild(frame);
+        RetailWindowHandle handle = root.RegisterWindow("main-panel", frame);
+
+        Assert.True(handle.ResizeTo(frame.Width, 2_000f));
+
+        Assert.Equal(475f, frame.Height);
+        Assert.Equal(root.Height, frame.Top + frame.Height);
+    }
+
     [Fact]
     public void FocusAndCaptureTransitions_AreScopedToOwningHandle()
     {