add max-height style to allow long prompt text to scroll and not escape viewport

[edwardsharp]

hi! cool product! was playing around and noticed some bugginess with the prompt text input field where if there's a long prompt the textarea will not scroll and it will keep expanding until it goes off the top edge of the viewport. i was able to run this locally to test (had to hack out some stuff to get the prompt textarea to render); see before & after screenshots.

one other thing, fwiw: i didn't understand is why the <textarea /> has spellcheck="false"? i'm the worst at spelling so not having red squiggles wouldn't be my preference. there's probably a reason for it, tho; so i didn't change it.

also looking forward to the resolve from #138 because it was a little confusing at first that i couldn't edit the prompt again. it wasn't very difficult to realize i just needed to create a new prompt and copy/paste my old one in to keep editing. oh and deleting prompts would be cool, too. 🤷

before

Text-to-CAD heading gets pushed off screen and so do the context of the prompt text; the text is not able to scroll.

after

heading stays, text can scroll (see scrollbar 😎)

[vercel]

@edwardsharp is attempting to deploy a commit to the Zoo Team on Vercel.

A member of the Team first needs to authorize it.

[franknoirot]

Wow hey @edwardsharp I apologize I didn't see your PR because I've been heads down on modeling-app! This is on my radar now

[franknoirot]

Thanks for contributing!