Page-Shell Banner Canonicals
Open the signed-off `page-shell-banner` states in separate tabs so the shell-owned banner family can be
reviewed directly on its dedicated render surface rather than only inside the page-shell template demo.
Use /design-system/templates/page-shell for
the host-shell demo and keep this page for canonical truth.
Canonical Set
Page-Shell Banner Reference States
Review these as dedicated banner-family states: four-state stack, success, warning, danger, and the remaining stack after one dismiss action.