fix: social gate round 2, part 1 - border-only move cursor, literal-\n

empty state, retail amber row selection

- Move cursor (user-directed, ALL windows): HoverWindowMove now
  advertises only where the window frame element itself wins the
  hit-test - its border pixels; interior points resolve to content
  children. Matches retail's Dragbar-chrome-only move cursor.
  Whole-surface dragging still works, it just does not advertise.
- Empty-state text (round 2): the DAT stores the LITERAL two-character
  escape backslash-n (probe-verified - the dump printed the escape, not
  line breaks), so the round-1 newline split never matched. Escapes are
  normalized before splitting in DatWidgetFactory authored text.
- Selected fellow amber (user: "check retail"): probe-verified - the
  row name band 0x10000282 AUTHORS the retail selected-row art
  (DirectState 0x06001450 + Highlight 0x06001451, the amber). Selection
  flips the band's ActiveState to Highlight; no invented tint.

App suite 4,976/3 skips. Confirmation-text + refused-drop-notification
research (the round's items 4-5) lands as part 2.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/AcDream.App/UI/UiRoot.cs

@@ -148,9 +148,13 @@ public sealed class UiRoot : UiElement
             var window = FindWindow(target);
             if (window is not { Draggable: true })
                 return false;
-            return !target.IsDragSource
-                && !target.CapturesPointerDrag
-                && !target.HandlesClick;
+            // 2026-08-13 gate (user-directed, all windows): the move cursor
+            // advertises ONLY on the window's own chrome — the frame's border
+            // pixels are the only place the frame element itself wins the
+            // hit-test (interior points resolve to content children), which
+            // matches retail's Dragbar-chrome-only move cursor. Whole-surface
+            // dragging still WORKS; it just no longer advertises over content.
+            return ReferenceEquals(target, window);
         }
     }
     private (uint tex, int w, int h)? _dragGhost;