Hook up a shell for password checking in enter password.

* Add error screens for invalid passwords and password mismatches.
Password management fixing. Generic error dialog handling.

* Add a password-not-set error dialog.
* Pass the email address to checkPasswordCorrect and setPassword functions.
* Add generic error dialog handling.
Underline the user's email address in the success screens.

Get rid of the bottom logo whenever focusing an input element.
Generalize the scroll on input focus code.

Add the "scroll-on-focus" class to an input element to have it scrolled into view whenever focused.
Show the "Connecting to Firefox" intersticial screen after the user enters their email address.