how to make flkty.next(true) also work for keyboard next?

**Test case:** https://codepen.io/desandro/pen/azqbop

Hey I'm using flkty.next(true); with clicking buttons, but I'm wondering how I can do do that simultaneously when users press "next" on their keyboard?

Start with the linked CodePen and the documented flkty.next(true) entry point. Reproduce the button behavior, then check how keyboard navigation is handled; done means the supported way to trigger the same behavior is clear, either through documentation or a confirmed usage example.

Written by the indexing model from the issue text.