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/UiItemSlot.cs

@@ -171,6 +171,9 @@ public sealed class UiItemSlot : UiElement
     /// a bound slot. Wired by <c>ToolbarController</c> to the use-item callback.</summary>
     public Action? Clicked { get; set; }
 
+    /// <summary>Invoked by <see cref="OnEvent"/> when a double-click lands on a bound slot.</summary>
+    public Action? DoubleClicked { get; set; }
+
     /// <inheritdoc/>
     public override bool OnEvent(in UiEvent e)
     {
@@ -184,6 +187,9 @@ public sealed class UiItemSlot : UiElement
             case UiEventType.Click:
                 Clicked?.Invoke();
                 return true;
+            case UiEventType.DoubleClick:
+                DoubleClicked?.Invoke();
+                return true;
 
             case UiEventType.DragBegin:
                 // Notify the source list's handler so it can lift (remove + wire) — retail