Fix pageAdmin setPrevioiusPageUsingActivePage writing to wrong property

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/stores/pageAdmin.js

@@ -47,7 +47,7 @@ export default defineStore('pageAdminStore', {
     * Set the previous(usually current) pages to the ones we just decide. 
     */
     setPrevioiusPageUsingActivePage() {
-      this.previoiusPage = this.activePage;
+      this.previousPage = this.activePage;
     },
     /**
      * Set the boolean value of status of pending state of the pate