Friends67: Screen Time Control

empty screens now show what they'll look like once you're using them — a sample downtime rule, a study session, a couple of friend requests. picking your mode during setup previews what each one actually does, side by side. the "were you invited?" screen works properly now: what you were given shows up straight away instead of on the next launch, and a code that doesn't work finally tells you why. clearer wording on the evening shield, the friends tab and the invite screen.