log out of medusa and reset cart on supabase logout

packages/supabase/src/hooks/use-sign-out.ts

@@ -1,12 +1,14 @@
 import { useMutation } from '@tanstack/react-query';
 
 import { useSupabase } from './use-supabase';
+import { signout } from '../../../features/medusa-storefront/src/lib/data/customer';
 
 export function useSignOut() {
   const client = useSupabase();
 
   return useMutation({
-    mutationFn: () => {
+    mutationFn: async () => {
+      await signout(undefined, false);
       return client.auth.signOut();
     },
   });