fix(core-flows): use product title for line item title (#12397)

* fix(core-flows): use prduct title for line item title

* fix: module tests

* fix: http tests

* fix: display item subtitle instead of prod title as secondary text in line item

* fix: claim/exchange items

packages/core/core-flows/src/cart/utils/prepare-line-item-data.ts

@@ -127,8 +127,8 @@ export function prepareLineItemData(data: PrepareLineItemDataInput) {
 
   let lineItem: any = {
     quantity: item?.quantity,
-    title: variant?.title ?? item?.title,
-    subtitle: variant?.product?.title ?? item?.subtitle,
+    title: variant?.product?.title ?? item?.title,
+    subtitle: variant?.title ?? item?.subtitle,
     thumbnail: variant?.product?.thumbnail ?? item?.thumbnail,
 
     product_id: variant?.product?.id ?? item?.product_id,