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>

src/AcDream.App/UI/RetailCursorCatalog.cs

@@ -0,0 +1,30 @@
+namespace AcDream.App.UI;
+
+/// <summary>Retail global cursor enum metadata used outside LayoutDesc widget states.</summary>
+internal static class RetailCursorCatalog
+{
+    public const uint CursorEnumTable = 6;
+
+    // ClientUISystem::UpdateCursorState (0x00564630):
+    // TARGET_MODE_USE_TARGET -> enum 0x27 when no SmartBox target is found,
+    // enum 0x28 when ItemHolder::IsTargetCompatibleWithTargetingObject returns true,
+    // enum 0x29 when it returns false. UIElementManager::SetCursor is called
+    // with hotspot (14,14) for all three.
+    public static bool TryGetGlobalCursor(CursorFeedbackKind kind, out RetailCursorSpec spec)
+    {
+        spec = kind switch
+        {
+            CursorFeedbackKind.TargetPending => new RetailCursorSpec(0x27u, 14, 14),
+            CursorFeedbackKind.TargetValid => new RetailCursorSpec(0x28u, 14, 14),
+            CursorFeedbackKind.TargetInvalid => new RetailCursorSpec(0x29u, 14, 14),
+            _ => default,
+        };
+
+        return spec.IsValid;
+    }
+}
+
+internal readonly record struct RetailCursorSpec(uint EnumId, int HotspotX, int HotspotY)
+{
+    public bool IsValid => EnumId != 0;
+}