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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>
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src/AcDream.App/UI/UiChatScrollbar.cs

@@ -89,10 +89,11 @@ public sealed class UiChatScrollbar : UiElement
         // sprite (~16×32) repeats to fill the element height instead of stretch-distorting.
         DrawTiled(ctx, resolve, TrackSprite, 0f, 0f, Width, Height);
 
-        // Up button — top ButtonH rows (directional arrow art, drawn 1:1).
-        DrawSprite(ctx, resolve, UpSprite, 0f, 0f, Width, ButtonH);
+        // Up button — top ButtonH rows. The dat up/down arrow sprites both point DOWN
+        // (confirmed by sprite export), so the TOP button is drawn V-FLIPPED to point UP.
+        DrawSpriteFlipV(ctx, resolve, UpSprite, 0f, 0f, Width, ButtonH);
 
-        // Down button — bottom ButtonH rows.
+        // Down button — bottom ButtonH rows (down arrow as-is).
         DrawSprite(ctx, resolve, DownSprite, 0f, Height - ButtonH, Width, ButtonH);
 
         // Thumb — only when content overflows the view. Retail 3-slice: top cap +
@@ -127,6 +128,17 @@ public sealed class UiChatScrollbar : UiElement
         ctx.DrawSprite(tex, x, y, w, h, 0f, 0f, 1f, 1f, Vector4.One);
     }
 
+    /// <summary>Draw a sprite 1:1 but vertically FLIPPED (V0/V1 swapped) — used to point
+    /// the top scroll button's (down-art) arrow upward.</summary>
+    private void DrawSpriteFlipV(UiRenderContext ctx, Func<uint, (uint tex, int w, int h)> resolve,
+        uint id, float x, float y, float w, float h)
+    {
+        if (id == 0 || w <= 0f || h <= 0f) return;
+        var (tex, _, _) = resolve(id);
+        if (tex == 0) return;
+        ctx.DrawSprite(tex, x, y, w, h, 0f, 1f, 1f, 0f, Vector4.One);
+    }
+
     /// <summary>Draw a sprite TILED to fill the dest rect (UV-repeat at native size on
     /// both axes — the UI texture is GL_REPEAT-wrapped). A native-width axis gives 1:1.</summary>
     private void DrawTiled(UiRenderContext ctx, Func<uint, (uint tex, int w, int h)> resolve,