Action buttons drop from size=lg with px-6 + font-semibold to a
compact size=sm pill with a subtle shadow. PageShell trims mobile
top padding from 24px to 16px and the inter-section gap from 24px
to 16px on small screens (desktop unchanged) so the header row
doesn't dominate the top of the page when the H1 is hidden.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>