Mirror the course list-row fix in the demo story: make the group a
container query that stacks below 48rem, cap tags at 3 with a +N pill,
and render the Default story full-width (padded) so both the stacked and
column layouts are visible. Uses unprefixed utilities since Storybook
generates those from its own Tailwind scan (prefixed classes only ship
in the prebuilt @cio/ui output.css).