- all pages (landing, both tools, server error pages) render on Carbon's
g100 theme via <body class="app cds--g100">; token consumers follow
automatically, including component shadow styles through the inherited
--cds-* custom properties
- dark base on <html> so no light flash around the viewport
- step chips and tool icons use the brand blue: layer-selected-inverse
inverts to a LIGHT token in g100, which had made them white-on-white
- page titles breathe: .page-head top margin 1.5rem -> 2.75rem
- new test asserting every page renders on g100 (44 total)