refactor(catalog): enhance variant options retrieval by restoring canonical values from reserved cart items

app/Domains/Catalog/Controllers/CatalogController.php

@@ -125,6 +125,7 @@ class CatalogController extends Controller
 
         $includedVariantId = null;
         $cartItemId = $request->validated('cart_item_id');
+        $selectedValues = $request->validated('selected_values', []);
 
         if ($cartItemId !== null) {
             $cartItem = $cartService->show($tenant, $request)
@@ -132,12 +133,18 @@ class CatalogController extends Controller
                 ->firstWhere('id', (int) $cartItemId);
             abort_unless($cartItem?->catalog_item_id === $catalogItem->id, 404);
             $includedVariantId = $cartItem->variant_id;
+
+            if ($selectedValues === [] && $cartItem->variant !== null) {
+                $selectedValues = $cartItem->variant
+                    ->selectorOptions($catalogItem->itemAttributes)
+                    ->all();
+            }
         }
 
         return CatalogVariantOptionsResource::make(
             $variantSelectionService->options(
                 $catalogItem,
-                $request->validated('selected_values', []),
+                $selectedValues,
                 $includedVariantId,
             )
         );