create useUntitledPage hooks with SWR

apps/app/src/stores/page.tsx

@@ -239,6 +239,22 @@ export const useSWRxPageRevision = (pageId: string, revisionId: Ref<IRevision>):
   );
 };
 
+export const useUntitledPage = (pageId: string): SWRResponse<boolean> => {
+
+  const key = `untitled/${pageId}`;
+
+  return useSWR(key, null);
+
+};
+
+export const mutateUntitledPage = (pageId: string, isUntitledPage: boolean): void => {
+
+  const key = `untitled/${pageId}`;
+
+  mutate(key, isUntitledPage);
+
+};
+
 /*
  * SWR Infinite for page revision list
  */