Import functionality: import button hard to read and only enables when leaving the input

[rajbos]

Using the import functionality to import a git repo, the button is hard to read (dark theme) and only gets enabled when you leave the input. This is inconsistent with different places in the UI (delete repo popup) and stumped some of my workshop participants.

Enable the button (maybe check for .git in the text?) and enable the ENTER key to start the import.

Example:
https://user-images.githubusercontent.com/6085745/142586476-afd374d4-fc48-44df-8fb9-c25ff8e6069a.mp4