The first launch becomes a counted flow. Two new steps: a backup step,
shown only when nothing you write to is synced anywhere, which picks a
folder and turns automatic backup on in one action; and a view step that
picks the default view and month style from live previews.
onboardingPlan() derives the whole flow from the stored answers, keeping
completed steps so the counter never renumbers. The optional steps only
exist for an install that went through the grant in-app, so existing
users see nothing new.
Week, Day and Agenda gain the scaled-down live preview Month already had,
sharing one viewport scaler and one set of stand-in events.
Jean-Luc Makiola
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