feat: add lazy loading to product images across market components

- Implemented lazy loading for product images in CartItem, CartSummary, ProductCard, ProductDetailDialog, CheckoutPage, and StallView components.
- This enhancement improves performance by deferring the loading of off-screen images, resulting in faster initial page load times and a smoother user experience.

These changes optimize image handling across the market module, contributing to better resource management and user interaction.

src/modules/market/components/ProductCard.vue

@@ -6,6 +6,7 @@
         :src="product.images?.[0] || '/placeholder-product.png'"
         :alt="product.name"
         class="w-full h-48 object-cover"
+        loading="lazy"
         @error="handleImageError"
       />