Directory display after folder selection

[mekline]

Right now, the folder selection dialog reverts to "Choose Files/No file chosen" after a folder is selected. Fix this, and add some info in the top box to help the user understand what's happening.

Note: I think there is some standard for how the "Choose File" dialog tends to look on websites when a folder has been selected and truncated for space, often you can hover your mouse to reveal the entire filepath. Anyway, if you can choose options to do that standard thing, please do so! I also don't care e.g. whether the file path is displayed next to or underneath the Choose Files button

Also: Oops, I used "more" in one case and "additional" in another below; please do something reasonable and standard for all truncation communication around the app :)

Mockup, prior to selection:

Mockup, post selection for a success case:

A failure case (I picked my data folder instead of the containing folder):