Thanks for the UX updates. Looks great! Thanks also for the misc fixes, they're resolving the issues too, except the scroll to file in case of deeply nested/large directories, which is minor and can be handled separately.

Yep, I've created #590 to track this

Two tiny nits for your consideration (looks ready to merge and release otherwise):

1. in the package-dependency explorer do you think it would be nicer to use PackageURLs all the way, i.e.
   instead of maven/org.elasticsearch.plugin/[email protected] use: pkg:maven/org.elasticsearch.plugin/[email protected] on the left package selectors.

This takes a bit more space for all PURLs but is more consistent.

Yep, I think that's more consistent

2. Also do you think it's worthwhile to update the default width of the left pane more on the package-dependency explorer to be at least equal to the right pane for details (or even more?) as the PURLs usually are overflowed to the next line, but on the right there is plenty of free space. I usually always increase the size myself for viewing so considering if this should be default.

Unlike other explorers, there isn't much on the right pane here, I think 50% should be ideal for now
Later we can see what's comfortable for others after the review

Also, note that we have an experimental table of dependencies in packages explorer on the right pane in experiment/dependenciesViews If we go ahead with it, we might want to reconsider this width
That's going to be after the RC release, so we'll track it in it's own PR