feat(ui): D.2b item interaction + retail cursors + live character sheet

Lands the codex-worktree D.2b stream plus the extraction the 2026-07-02
UI architecture review mandated before commit:

- ItemInteractionController: single owner of double-click use/equip/
  container-open, targeted-use mode (health kits), drag-out drop;
  toolbar shortcut drags don't drop the real item. ItemEquipRules for
  multi-slot (coat) coverage via equip masks.
- Cursor phase: CursorFeedbackController (semantic priority chain:
  drag > resize > window-move > target-mode > text) + RetailCursorCatalog
  (enums 0x27/0x28/0x29, hotspot 14,14; ClientUISystem::UpdateCursorState
  0x00564630) resolved through the portal EnumIDMap chain by
  RetailCursorResolver; RetailCursorManager applies dat cursor art to the
  OS cursor. Register row AP-72 covers the OS standard-cursor fallback.
- Character window goes live: CharacterSheetProvider owns sheet assembly,
  XP-curve/raise-cost math and the raise flow — extracted out of
  GameWindow per Code Structure Rule 1 instead of committing the ~430-line
  feature body there. Optimistic XP/credit debits go through eventful
  store APIs (new ClientObjectTable.UpdateInt64Property +
  LocalPlayerState.DebitIntProperty/DebitInt64Property) instead of raw
  property-dictionary writes; register row AP-73 covers the still-missing
  raise ledger (#163).
- RetailWindowFrame: the shared nine-slice window mount recipe; the
  character window uses it, remaining windows migrate via #164.
- Status-bar buttons toggle inventory/character windows; retail row-major
  backpack ordering; WorldSession.SendUseWithTarget + raise/train sends.

GameWindow shrinks 14,214 -> 13,877 lines despite the new features; the
sheet/raise logic is unit-tested in CharacterSheetProviderTests instead
of trapped in the god object. Build green; full suite 3,286 tests pass.

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

tests/AcDream.App.Tests/UI/Layout/InventoryFrameImportProbe.cs

@@ -2,6 +2,7 @@ using System;
 using System.IO;
 using AcDream.App.UI;
 using AcDream.App.UI.Layout;
+using AcDream.Core.Items;
 using DatReaderWriter;
 using DatReaderWriter.Options;
 using Xunit;
@@ -86,4 +87,34 @@ public class InventoryFrameImportProbe
                 "(else the Alphablend backdrop overpaints/washes out the panel content)");
         }
     }
+
+    [Fact]
+    public void Close_button_resolves_and_invokes_controller_close_callback()
+    {
+        var datDir = DatDir();
+        if (datDir is null) return;   // CI: no live dat - skip
+
+        using var dats = new DatCollection(datDir, DatAccessType.Read);
+        var layout = LayoutImporter.Import(dats, Frame, _ => (0u, 0, 0), null);
+        Assert.NotNull(layout);
+
+        var close = layout!.FindElement(WindowChromeController.InventoryCloseButtonId);
+        Assert.NotNull(close);
+        Assert.True(close is UiButton or UiDatElement,
+            $"inventory close button resolved to {close?.GetType().Name ?? "null"}");
+
+        int closes = 0;
+        InventoryController.Bind(
+            layout,
+            new ClientObjectTable(),
+            playerGuid: static () => 0u,
+            iconIds: static (_, _, _, _, _) => 0u,
+            strength: static () => 100,
+            datFont: null,
+            onClose: () => closes++);
+
+        close!.OnEvent(new UiEvent(0u, close, UiEventType.Click));
+
+        Assert.Equal(1, closes);
+    }
 }