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/Layout/DatWidgetFactory.cs

@@ -707,11 +707,17 @@ public static class DatWidgetFactory
             // newlines (the fellowship empty-state is three sentences over
             // '\n's). A single Line renders them as one clipped run — split
             // into one Line per authored line, exactly as retail's multiline
-            // UIElement_Text draws them. The provider re-reads DefaultColor
+            // UIElement_Text draws them. Gate round 2: the DAT stores the
+            // LITERAL two-character escape "\n" (0x5C 0x6E — probe-verified:
+            // the dump printed backslash-n, not a line break), so normalize
+            // the escape before splitting. The provider re-reads DefaultColor
             // per call (NOT captured eagerly) so state-driven font-color
             // changes keep tracking, the same live-color contract the
             // single-line provider always had.
-            string[] parts = [.. authored.Split('\n').Select(static p => p.TrimEnd('\r'))];
+            string[] parts = [.. authored
+                .Replace("\\n", "\n")
+                .Split('\n')
+                .Select(static p => p.TrimEnd('\r'))];
             t.LinesProvider = () =>
                 [.. parts.Select(p => new UiText.Line(p, t.DefaultColor))];
         }