feat: implement browse by manufacturers section

Signed-off-by: Chloe <pinkcloudvnn@gmail.com>

lib/shopify/index.ts

@@ -589,7 +589,7 @@ export async function getPage(handle: string): Promise<Page> {
 
   const page = res.body.data.pageByHandle;
 
-  if (page.metafield) {
+  if (page?.metafield) {
     const metaobjectIds = parseMetaFieldValue<string[]>(page.metafield) || [];
 
     const metaobjects = await getMetaobjectsByIds(metaobjectIds);

lib/shopify/queries/metaobject.ts

@@ -4,6 +4,7 @@ export const getMetaobjectsQuery = /* GraphQL */ `
       edges {
         node {
           id
+          type
           fields {
             reference {
               ... on Metaobject {