Renders a MUI <Breadcrumbs> trail from items, with aria-label="breadcrumb". Each entry is a
CrumbLink; CrumbProps is deep-merged into every item for shared defaults.
sx merge order: base crumb styles → useMuitilsConfig().Crumbs.sx → props.sx.
navigation: props.navigation wins; otherwise useMuitilsConfig().Crumbs.navigation is used, defaulting
to { preferred: 'anchor' }.
Remaining props are forwarded to MUI Breadcrumbs.
CrumbsProps: requireditems, optionalCrumbProps,navigation,sx, and anyBreadcrumbsProps.