Disable transitions for snapshot cards
Disable transitions for snapshot cards

There was a .1s transition to all styles applied to the snapshot card.
While keyboard-navigating, the delay was annoying, as you had to stop
hitting j/k for a split second to know what you were currently focusing.
Removing the transition (which mostly came from the `.thumbnail`
Bootstrap component) made keyboard navigation feel much faster.

kalw/diffux,kalw/diffux,diffux/diffux,diffux/diffux,diffux/diffux,kalw/diffux