fix(product-list): prioritize first image in non-carousel layouts and update tests

src/app/features/store/pages/store-home-page/store-home-page.component.html

@@ -22,7 +22,7 @@
     No hay productos disponibles en este momento.
   </p>
 } @else {
-  @for (group of catalog(); track group.id) {
+  @for (group of catalog(); track group.id; let first = $first) {
     <app-store-section [attr.id]="group.code" [title]="group.title">
       <app-product-list
         [layout]="group.layout"
@@ -30,6 +30,7 @@
         [items]="group.items"
         [loading]="isGroupLoading(group.id)"
         [loadImages]="!hasMainCarouselImages() || mainCarouselReady()"
+        [prioritizeFirstImage]="first && !hasMainCarouselImages()"
         [unavailableVariantIds]="unavailableVariantIds()"
         [savingProductIds]="savingProductIds()"
         (buy)="onBuyProduct($event)"