ScaledViewPreview measures real screen composables at a phone viewport and
scales the finished layout down; ViewPreviewFrame is the tonal plate it sits
on, cross-fading between options at the grouped rows' width and radius so
preview and options read as one stack.
Converged from Calendula's view and month-style choosers, where the pattern
was invented, and now Agendula's quick-add step. The viewport height is a
parameter here rather than a calendar-shaped constant.
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