Polish product pages with subcategory filters, gallery, and denser grids.

Move category showcase to product routes, add clickable subcategory chips on category pages, and tighten banner/card spacing for mobile-to-desktop layouts.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lib/meshkee.ts

@@ -200,6 +200,18 @@ export function productImage(product: Product): string | null {
   return product.thumbnail || product.image || product.thumbnailUrl || null;
 }
 
+/** Unique gallery URLs: `images[]` first, then the primary thumbnail/image. */
+export function productImages(product: Product): string[] {
+  const seen = new Set<string>();
+  const out: string[] = [];
+  for (const url of [...(product.images ?? []), product.thumbnail, product.image, product.thumbnailUrl]) {
+    if (!url || seen.has(url)) continue;
+    seen.add(url);
+    out.push(url);
+  }
+  return out;
+}
+
 export function productPriceLabel(product: Product): string {
   if (product.store?.minPrice) {
     const formatted = new Intl.NumberFormat("fa-IR").format(product.store.minPrice);