Hint, ActionRow, Toolbar, EmptyState and ExternalLink replace the muted
text, button row, refresh bar, empty line and _blank anchor that each page
restyled under its own class. ExpandableCard (with a loading twin) holds the
builds and recent-runs cards, which had identical head and body CSS. The
create form's raw checkbox becomes CheckboxField. The components page shows
each new piece.
The schedules tab is gone from the nav. Its page, unchanged inside, is a card
on /messages under the broadcast card that starts shut and reads nothing until
opened; its add button and refresh picker move into the card's body.
/schedules redirects to /messages. Docs follow.
