feat(ui): show price in public view and admin item card; fix quantity badge in claims list

- Public wishlist page now displays item price (formatted as BRL) below the
  item name when a price is set
- Admin ItemCard shows price and quantity badge so items can be scanned at a
  glance without opening the edit form
- Claims list no longer shows "· 1 un." for single-unit items (the unit count
  is only displayed when item.quantity > 1)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/admin/ItemCard.tsx

@@ -64,6 +64,17 @@ export default function ItemCard({
             <h5 className="text-base font-semibold text-gray-900 dark:text-white">
               {item.name}
             </h5>
+            {item.price != null && (
+              <p className="text-sm text-indigo-600 dark:text-indigo-400 mt-0.5">
+                {new Intl.NumberFormat('pt-BR', { style: 'currency', currency: item.currency || 'BRL' }).format(item.price)}
+                {item.quantity > 1 && ` · Qtd: ${item.quantity}`}
+              </p>
+            )}
+            {item.price == null && item.quantity > 1 && (
+              <p className="text-sm text-gray-500 dark:text-gray-400 mt-0.5">
+                Qtd: {item.quantity}
+              </p>
+            )}
             {item.description && (
               <p className="text-base text-gray-600 dark:text-gray-400 mt-1">
                 {item.description}