feat(catalog): exclude out-of-stock items and update variant visibility logic

app/Domains/Catalog/Resources/CatalogFeaturedItemResource.php

@@ -46,7 +46,7 @@ class CatalogFeaturedItemResource extends JsonResource
                 $availableStock,
                 $remainingUserQuota,
             ),
-            'variants' => $catalogItem->variants
+            'variants' => $catalogItem->visibleVariants()
                 ->map(function (Variant $variant) use ($catalogItem, $remainingUserQuota): array {
                     $variantStock = $catalogItem->inventory_policy === InventoryPolicy::Unlimited
                         ? null
@@ -115,7 +115,7 @@ class CatalogFeaturedItemResource extends JsonResource
     private function firstImageUrl(CatalogItem $catalogItem): ?string
     {
         $attachment = $catalogItem->attachments->first()
-            ?? $catalogItem->variants
+            ?? $catalogItem->visibleVariants()
                 ->flatMap(fn (Variant $variant) => $variant->attachments)
                 ->first();