Fix force close when user rolls back clock

If the user manually rolls back the device clock to before the
account setup time, the app would force close. Update the account
setup time checks to handle this case.

Bug introduced by the history feature.

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Fix black-on-black text issue on devices with a dark theme

Use built-in Android styles to auto-select appropriate text color.

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>