stacked-bars-double-consume-window-insets

Inset consumption travels to a composable's descendants and never to its siblings, so two inset-aware bars stacked in one column each reserve the system bar and open a band of dead space exactly one bar tall. Covers parameterising a bar's windowInsets with the framework default, deciding once who consumes, and why the same component must keep the default at its overlay call sites. Use when a strip of empty space…