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/Layout/PaperdollController.cs

@@ -75,6 +75,7 @@ public sealed class PaperdollController : IItemListDragHandler
     private readonly Func<uint> _playerGuid;
     private readonly Func<ItemType, uint, uint, uint, uint, uint> _iconIds;
     private readonly Action<uint, uint>? _sendWield;     // (itemGuid, equipMask) → GetAndWieldItem 0x001A
+    private readonly ItemInteractionController? _itemInteraction;
     private readonly List<(EquipMask Mask, UiItemList List)> _slots = new();
 
     // ── Slots-toggle state ────────────────────────────────────────────────────────────────────────
@@ -85,9 +86,10 @@ public sealed class PaperdollController : IItemListDragHandler
     private PaperdollController(
         ImportedLayout layout, ClientObjectTable objects, Func<uint> playerGuid,
         Func<ItemType, uint, uint, uint, uint, uint> iconIds, Action<uint, uint>? sendWield,
-        uint emptySlotSprite, UiDatFont? datFont)
+        uint emptySlotSprite, UiDatFont? datFont, ItemInteractionController? itemInteraction)
     {
         _objects = objects; _playerGuid = playerGuid; _iconIds = iconIds; _sendWield = sendWield;
+        _itemInteraction = itemInteraction;
 
         for (int i = 0; i < SlotMap.Length; i++)
         {
@@ -97,6 +99,13 @@ public sealed class PaperdollController : IItemListDragHandler
             list.Cell.SourceKind  = ItemDragSource.Equipment;
             list.Cell.SlotIndex   = i;              // SlotMap position = this equipped item's drag-payload SourceSlot when dragged out to unwield
             list.Cell.EmptySprite = emptySlotSprite; // visible empty-slot frame so every position is seen + usable. The live
+            list.Cell.UseTargetGuidProvider = _playerGuid;
+            list.Cell.Clicked = () => { _itemInteraction?.AcquireSelfTarget(); };
+            list.Cell.DoubleClicked = () =>
+            {
+                if (list.Cell.ItemId != 0)
+                    _itemInteraction?.ActivateItem(list.Cell.ItemId);
+            };
                                                      // 3D character (the "figure" — Slice 1/2 correction: NOT a per-slot
                                                      // silhouette) is the doll viewport, which arrives in Slice 2 with the Slots toggle.
             // Cell.SpriteResolve + the default accept/reject sprites (ItemSlot_DragOver_Accept ring
@@ -140,8 +149,9 @@ public sealed class PaperdollController : IItemListDragHandler
     public static PaperdollController Bind(
         ImportedLayout layout, ClientObjectTable objects, Func<uint> playerGuid,
         Func<ItemType, uint, uint, uint, uint, uint> iconIds, Action<uint, uint>? sendWield = null,
-        uint emptySlotSprite = 0u, UiDatFont? datFont = null)
-        => new PaperdollController(layout, objects, playerGuid, iconIds, sendWield, emptySlotSprite, datFont);
+        uint emptySlotSprite = 0u, UiDatFont? datFont = null,
+        ItemInteractionController? itemInteraction = null)
+        => new PaperdollController(layout, objects, playerGuid, iconIds, sendWield, emptySlotSprite, datFont, itemInteraction);
 
     private void OnObjectChanged(ClientObject o) { if (Concerns(o)) Populate(); }
     private void OnObjectMoved(ClientObject o, uint from, uint to)
@@ -209,7 +219,7 @@ public sealed class PaperdollController : IItemListDragHandler
     {
         var item = _objects.Get(payload.ObjId);
         if (item is null) return;
-        EquipMask wieldMask = item.ValidLocations & MaskFor(targetList);
+        EquipMask wieldMask = ItemEquipRules.ResolvePaperdollDropWieldMask(item, MaskFor(targetList));
         if (wieldMask == EquipMask.None) return;       // not wieldable here (defensive; OnDragOver already rejected)
         _objects.WieldItemOptimistic(payload.ObjId, _playerGuid(), wieldMask);
         _sendWield?.Invoke(payload.ObjId, (uint)wieldMask);