RangePicker carried a byte-for-byte copy of ui/segmented.tsx's markup; it
now renders that component instead.
The dashboard's own segmented widget stays where it is: it is not a copy
but a look-aware control, drawn per look in
Dashboard/ui/{fluksio,glass,material}/Controls.tsx over the shared
useSegmented behaviour. Note that in segmented.tsx in place of the stale
size-prop plan.