feat(checkout): enforce editing policy on items

app/Domains/Purchase/Resources/PurchaseItemResource.php

@@ -30,7 +30,7 @@ class PurchaseItemResource extends JsonResource
                 ? $this->sourceCatalogItem
                 : null;
             $includeVariants = $tenant instanceof Tenant
-                && $tenant->cart_editing_policy->allowsVariantChanges()
+                && $tenant->checkout_editing_policy->allowsVariantChanges()
                 && $catalogItem !== null
                 && $catalogItem->relationLoaded('variants');
 
@@ -67,6 +67,9 @@ class PurchaseItemResource extends JsonResource
         $imageUrl = $displayImage
             ? $this->resolveImageUrl($selectedItem, $catalogItem)
             : null;
+        $includeVariants = $tenant instanceof Tenant
+            && $tenant->checkout_editing_policy->allowsVariantChanges()
+            && $catalogItem?->relationLoaded('variants');
 
         return [
             'id' => $this->id,
@@ -82,6 +85,16 @@ class PurchaseItemResource extends JsonResource
                 'imagen' => $imageUrl,
                 'attributes' => $variant === null ? [] : $this->resolveAttributes($variant),
             ],
+            'variants' => $this->when(
+                $includeVariants,
+                fn () => $catalogItem
+                    ->visibleVariants($this->variant_id)
+                    ->map(fn (Variant $availableVariant): array => $this->variantData(
+                        $catalogItem,
+                        $availableVariant,
+                    ))
+                    ->values(),
+            ),
         ];
     }