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

app/Domains/Catalog/Resources/CatalogSearchItemResource.php

@@ -16,8 +16,9 @@ class CatalogSearchItemResource extends JsonResource
     public function toArray(Request $request): array
     {
         $availableStock = $this->availableStock();
+        $visibleVariants = $this->visibleVariants();
         $attachment = $this->attachments->first()
-            ?? $this->variants
+            ?? $visibleVariants
                 ->flatMap(fn (Variant $variant) => $variant->attachments)
                 ->first();
 
@@ -30,7 +31,7 @@ class CatalogSearchItemResource extends JsonResource
             'image' => $attachment?->getTemporaryUrl(1440),
             'maximum_addable_quantity' => $this->maximumAddable($availableStock),
             'unavailable_message' => $this->unavailableMessage($availableStock),
-            'variants' => $this->variants
+            'variants' => $visibleVariants
                 ->map(function (Variant $variant): array {
                     $variantStock = $this->inventory_policy === InventoryPolicy::Unlimited
                         ? null