Nice work! Everything worked perfect for me out of the box. Just some UI nitpicks below, nothing that I think is preventing us from shipping so pick/choose what you think is worthwhile

• I think we can remove the "FileIcon". Lot of color, takes up horizontal space, and is potentially a bit confusing, e.g. a given package.json dep may or may not be also written in TS
• I think we should just use a lightgray PlusIcon for the leftmost "Add" action. The PlusCircleIcon is hard to read on small fonts in HeroIcons, and when it's the triangle it's unclear that you can still add it. Maybe warning goes alongside the URL somehow
• "Done" and "Go" are a bit confusing to me. Maybe "Go" becomes "Add", and "Done" becomes "Close"? It's also a bit unclear to me whether those buttons are supposed to be associated to the entire dialog, or just the form
• Feels like the title/start url needs a title of some sort

Got this when I didn't have a package.json

I think the spinners are a bit noisy with multiple loaders. I'd lean towards just removing

"No docs link found" isn't legible on dark mode unless the row is hovered

We have the horizontal space, so I think we could turn this into an "+ Add doc" button to make this more prominent