fix(ui): Slice 5.4 review corrections — the dropdown renders from its authored popup, retail cost semantics, auto-select, icon overlays

All nine review findings closed at root (one sub-item consciously
deferred):

F1 the category dropdown now draws: sprites/fonts wired and the popup
geometry read from the vendor menu's own authored popup LayoutDesc
0x21000043 (root 0x1000034F — correcting the review's 0x1000014F
transcription) per UIElement_Menu::MakePopup (pc:120705); chat's menu
is untouched and its tests prove it. The new test drives selection
through the REAL open/hit path the review flagged as bypassed.
F2+F3 the selected-item cost display ports VendorItemsUI::UpdateItemsUI
verbatim: quantity via the 0xDC41CB0 split-size mask (whole-stack for
ammo, per-unit for groceries/components; mask lives at the toolbar
SEEDING site pc:198784), plural names with retail's
fall-back-to-singular (pc:409056 — correcting the review's "name+s"
guess), full cost sentences with comma grouping and the player's coin
total, and Buy/Add buttons that disable without a selection.
F4 category switches auto-select the first filtered item (pc:201180).
F5 icon underlay/overlay/effects + plural name forwarded from the
already-parsed wire fields through VendorShopItem to the icon
composer. F6 a DIFFERENT vendor opens on its own first category;
same-vendor refresh preserves per the clamp. F7 scroll resets on
rebuild and authored empty slots fill; the right-click examine route
is consciously DEFERRED (shop items are not in ClientObjectTable and
the appraisal panel hard-requires it — documented, not faked).
F8 VendorState.Apply's fanout gets the same per-listener isolation as
Close/Reset. F9 AP-110/AP-161 wording corrected ("quantity-correct
pricing") and AP-161 rewritten to exactly the remaining conscious
gaps.

Clean-room complete solution with the #348 cursor fix in the same
tree: 11,334 passed / 4 skipped / 0 failed.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/AcDream.Core.Net/GameEventWiring.cs

@@ -424,7 +424,18 @@ public static class GameEventWiring
                     // supply-count field) -- VendorPricing.PerUnitValue's
                     // divisor for turning Value's stack-total wire number
                     // into a per-unit display price.
-                    item.Desc.StackSize);
+                    item.Desc.StackSize,
+                    // Slice 5.4 review fix F5: forward the icon overlay/
+                    // underlay/effects PublicWeenieDescParser already
+                    // captures, so a shop item's icon composites the same
+                    // way ExternalContainerController.CreateCell's does.
+                    item.Desc.IconUnderlayId,
+                    item.Desc.IconOverlayId,
+                    item.Desc.UiEffects,
+                    // Slice 5.4 review fix F2/F3: forward the plural name so
+                    // the browse panel can show "100 Arrows" instead of
+                    // fabricating a plural.
+                    item.Desc.PluralName);
             }
 
             vendor?.Apply(p.Value.VendorGuid, profile, shopItems);