MasterPageScaffold + DetailPageScaffold (desktop) — 424px right split
Customers
Jordan Avery
424px fixed
main constrained to width − 424 when detail open · CommonAppBar (title + rightActions)
DetailPage (mobile) = modal sheet
Jordan Avery
sheet + gray-05 drag handle over --overlay-trans-64 scrim
ModalPage / popup
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centered over scrim · page bg = white surface / gray-07 well