Hide pulsing dot when we display the Error message

[antlam]

As per issue #389, UX polish that we didn't have time to get to for Kona.

Basically, the pulsing dot is to convey "things are happening". But it's not necessary nor completely accurate when the error message comes in "Uh oh!...".

So, we should do the following:

• keep the same animations that we currently have for the error message + button
• fade out the pulsing dot (regular cross-fade is fine)
• animate in the error message + button to the center of the screen

When the user presses the button, the message animates out (the same as it does now) and the pulsing dot cross-fades back in

[mcomella]

Not actively working on this: unassign.