Wow. Stellar work. The TS looks really proper on first glance. I think you're right on zeitgeist -- we're going to need a lot more fundamental tools like this to build AI apps.

Technically speaking, I've long wondered about mount/unmount of components as panels are dragged about and their visibility changed. Sometimes it's more costly to mount/unmount than to display:none.

Second, you have basically a declarative structure for these panels, are there plans to expose a Vite plugin for example that could export saved TS layouts, where functions (ie: TS imports) map to the panel contents? (trying to think outside of JSX and more vanilla TS)

Fantastic work!