Improve dashboard dark theme accent color

The accent button on the resources page URL overflow looks odd. All other purple accents are the same color except for this button:

Accent buttons have a different color than other accents throughout the app.

What do other people think?

cc @IEvangelist

Start by comparing the accent button on the resources page URL overflow with the other purple accents shown in the issue. The thread asks what others think, so clarify the desired color before changing anything; done means the button’s accent matches the agreed-upon appearance.

Written by the indexing model from the issue text.