feat(checkout): enforce editing policy on items

app/Domains/Cart/Resources/CartItemResource.php

@@ -2,6 +2,7 @@
 
 namespace App\Domains\Cart\Resources;
 
+use App\Domains\Cart\Models\Cart;
 use App\Domains\Cart\Models\CartItem;
 use App\Domains\Catalog\Enums\InventoryPolicy;
 use App\Domains\Catalog\Models\Variant;
@@ -22,9 +23,13 @@ class CartItemResource extends JsonResource
         $selectedItem = $this->selectedItem();
         $imageUrl = null;
         $tenant = $request->route('tenant');
+        $checkoutCart = $request->route('cart');
         $displayImage = ! $tenant instanceof Tenant || $tenant->display_cart_item_images;
         $includeVariants = $tenant instanceof Tenant
-            && $tenant->cart_editing_policy->allowsVariantChanges();
+            && ($checkoutCart instanceof Cart
+                ? $tenant->checkout_editing_policy
+                : $tenant->cart_editing_policy)
+                ->allowsVariantChanges();
 
         if ($displayImage && $selectedItem?->relationLoaded('attachments')) {
             $imageUrl = $selectedItem->attachments->first()?->getTemporaryUrl(1440);