Right now kirby-vite has no easy way to do this, so I also suggest you use kirby-laravel-vite. This is definitely a feature I want to add to kirby-vite (I just haven’t used much panel css/js yet) so I’ll put this on the roadmap!
@hansipete I release a new version that supports pannel assets with vite, but it requires Kirby 4. @lukaskleinschmidt uses a great workaround for Kirby 3’s panel asset restrictions (you can’t use a full URL and you can’t use multiple files which is both needed in development) by injecting the panel assets in a router hook. I decided not to do this, since Kirby 4 was released just now and got rid of these restrictions
So if you are not bound to Kirby 3 checkout the documentation