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/CharacterIdentityText.cs

@@ -0,0 +1,68 @@
+namespace AcDream.App.UI.Layout;
+
+/// <summary>
+/// Retail character identity display helpers for gmStatManagementUI.
+/// Sources: gmStatManagementUI::UpdateCharacterInfo (0x004f0770) calls
+/// AppraisalSystem::InqGenderHeritageDisplay(gender 0x71, heritage 0xBC, 0),
+/// then appends the current CharacterTitleTable title when one is active.
+/// </summary>
+internal static class CharacterIdentityText
+{
+    public const uint GenderPropertyId = 0x71u;
+    public const uint HeritageGroupPropertyId = 0xBCu;
+
+    public static string StatHeaderLine(CharacterSheet sheet)
+    {
+        string? heritage = !string.IsNullOrWhiteSpace(sheet.Heritage)
+            ? sheet.Heritage
+            : sheet.Race;
+
+        string? title = StripLeadingArticle(sheet.Title);
+
+        if (string.IsNullOrWhiteSpace(sheet.Gender))
+            return Join(heritage, title);
+        return Join(sheet.Gender, heritage, title);
+    }
+
+    public static string? GenderDisplayName(int gender) => gender switch
+    {
+        1 => "Male",
+        2 => "Female",
+        _ => null,
+    };
+
+    public static string? HeritageGroupDisplayName(int heritageGroup) => heritageGroup switch
+    {
+        1 => "Aluvian",
+        2 => "Gharu'ndim",
+        3 => "Sho",
+        4 => "Viamontian",
+        5 => "Umbraen",
+        6 => "Gearknight",
+        7 => "Tumerok",
+        8 => "Lugian",
+        9 => "Empyrean",
+        10 => "Penumbraen",
+        11 => "Undead",
+        12 => "Olthoi",
+        13 => "Olthoi",
+        _ => null,
+    };
+
+    private static string Join(params string?[] parts)
+    {
+        return string.Join(" ", parts
+            .Where(p => !string.IsNullOrWhiteSpace(p))
+            .Select(p => p!.Trim()));
+    }
+
+    private static string? StripLeadingArticle(string? title)
+    {
+        if (string.IsNullOrWhiteSpace(title)) return null;
+
+        string trimmed = title.Trim();
+        return trimmed.StartsWith("the ", System.StringComparison.OrdinalIgnoreCase)
+            ? trimmed[4..]
+            : trimmed;
+    }
+}