feat(purchase-detail): update item details structure and handle null values in mapping

src/app/features/store/pages/account-page/pages/purchase-detail-page/purchase-detail-page.ts

@@ -79,12 +79,12 @@ export class PurchaseDetailPage implements OnInit {
   private mapItems(purchase: PurchaseDetailResponse): PurchaseItemViewModel[] {
     return purchase.items.map((item) => ({
       id: item.id,
-      title: item.product?.nombre ?? 'Producto sin nombre',
-      imageUrl: item.product?.imagen ?? null,
+      title: item.item_details.nombre || 'Producto sin nombre',
+      imageUrl: item.item_details.imagen,
       quantity: item.quantity,
-      attributes: (item.variant?.attributes ?? []).map((attribute) => ({
+      attributes: item.item_details.attributes.map((attribute) => ({
         label: attribute.name,
-        value: attribute.value,
+        value: attribute.value === null ? null : String(attribute.value),
       })),
       price: item.line_total,
       originalPrice: null,