Unclear what icons mean in Notifications view

[bamurtaugh]

I'd expect anything with a checkmark to be green - I was confused why there are red checkmarks:

Clicking in, I realize this icon means a PR is closed, but a checkmark doesn't == closed issue to me.

I thought hovering over the icon might give me a tooltip on what the status means, but it only provides me the repo and issue number.

[alexr00]

It's the same icon that GitHub uses, but probably it should be purple.

[mrleemurray]

@alexr00 agree - we should align colors with GH