Tint shop item thumbnails with the user's character layer colors.

Replace default gray previews so clothing and accessories in the shop grid reflect each layer's saved color, including skin tone for eyes.

lib/shop-preview.ts

@@ -1,5 +1,12 @@
 import type { AvatarCustomization } from "@/lib/avatar-customization-storage";
-import { parseVariantId, parseShopStyleItem, type ShopItemRecord } from "@/lib/shop-catalog";
+import type { HSL } from "@/lib/character/color-utils";
+import type { LayerColorState } from "@/lib/character/types";
+import {
+  isShopLayerId,
+  parseVariantId,
+  parseShopStyleItem,
+  type ShopItemRecord,
+} from "@/lib/shop-catalog";
 import {
   normalizeRoomBackgroundId,
   type RoomBackgroundId,
@@ -17,6 +24,21 @@ export function getShopPreviewRoomId(
   return normalizeRoomBackgroundId(base.roomBackground);
 }
 
+/** Tint colors for shop grid thumbnails — match the user's current layer colors. */
+export function getShopItemThumbnailColors(
+  item: ShopItemRecord,
+  colors: LayerColorState,
+): { color: HSL; skinColor?: HSL } {
+  if (!isShopLayerId(item.type)) {
+    return { color: colors.torso };
+  }
+
+  return {
+    color: colors[item.type],
+    skinColor: item.type === "eyes" ? colors.skin : undefined,
+  };
+}
+
 /** Build a non-persisted avatar state showing how a shop item would look. */
 export function buildShopItemPreviewCustomization(
   base: AvatarCustomization,