I want to implement a unsaved content alert feature in my project. Basically, if the user want to change to another page without saving the content he wrote a modal appears to warn it, but to do so I need to listen something like a "beforeRouteChange" event, which is not available on app router. I know there is a usePathname hook that can be used to listen "onRouteChange", but I want to listen to "beforeRouteChange"