@

feat(D.2b): data-driven channel menu chrome + greying + scroll-arrow fix

Investigation found the menu popup is fully dat-driven (UIElement_Menu::MakePopup
@0x46d310 reads LayoutDesc 0x21000006 elements 0x1000001C/1D/1E — the "stray" top-level
elements). Render the popup from the real sprites instead of a flat rect:
- panel 0x0600124C, item row 0x0600124E, selected row 0x0600124D; 191x17 rows, 2 cols.
- drawing rows as SPRITES also fixes the z-order (a DrawRect bg composited OVER the
  labels; sprites share the labels submission bucket so text lands on top).
- item greying: available channels white, unavailable salmon (colorPink) — static
  approximation (Say/General/Trade/LFG) with an AvailabilityProvider hook for live
  TurbineChat state; unavailable items are inert on click. Ports ResetAllTalkFocusMenuButtons.
- scroll arrows: both dat sprites point down (export-confirmed); V-flip the top button
  so it points up.
Tabs confirmed to have NO digits in retail (blank gold frames) — acdream already matches.

Build + 392 App tests green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@

src/AcDream.App/UI/Layout/ChatWindowController.cs

@@ -50,8 +50,11 @@ public sealed class ChatWindowController
     private const uint DownSprite     = 0x06004C6Cu;
 
     // Channel menu sprite ids (confirmed in chat element dump).
-    private const uint MenuNormal  = 0x06004D65u;
-    private const uint MenuPressed = 0x06004D66u;
+    private const uint MenuNormal       = 0x06004D65u;   // button face
+    private const uint MenuPressed      = 0x06004D66u;   // button pressed
+    private const uint MenuPopupBg      = 0x0600124Cu;   // popup panel fill (element 0x1000001C)
+    private const uint MenuItemRow      = 0x0600124Eu;   // item row bg (template 0x1000001E)
+    private const uint MenuItemSelected = 0x0600124Du;   // active channel row
 
     // ── Public surface ─────────────────────────────────────────────────────
 
@@ -225,11 +228,14 @@ public sealed class ChatWindowController
                 Width         = menuEl.Width,
                 Height        = menuEl.Height,
                 Anchors       = menuEl.Anchors,
-                DatFont       = datFont,
-                Font          = debugFont,
-                SpriteResolve = resolve,
-                NormalSprite  = MenuNormal,
-                PressedSprite = MenuPressed,
+                DatFont             = datFont,
+                Font                = debugFont,
+                SpriteResolve       = resolve,
+                NormalSprite        = MenuNormal,
+                PressedSprite       = MenuPressed,
+                PopupBgSprite       = MenuPopupBg,
+                ItemNormalSprite    = MenuItemRow,
+                ItemHighlightSprite = MenuItemSelected,
             };
             c.Menu.OnChannelChanged = k => c._activeChannel = k;
             menuParent.RemoveChild(menuEl);