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 two groups of fields had different column counts, so their edges never met,
and the price labels carried their unit, which wrapped in a monospace font and
pushed those inputs below their neighbours. Every group is one CSS grid now. The
provider fields sit under a "provider" heading, with the URL and the model each
on a full row so their placeholders are not cut off, shorter price labels and
the unit said once under them.
The classifier settings page showed model and effort only, so the API-key
or ACP runtime could be switched only through a raw API call. It now has a
runtime select, and under ACP the provider's URL, model and prices. A PUT
carries the provider only on the ACP runtime, so the stored record stays
for a switch back. Closes#5249
A classifier settings panel under the try-out form reads and saves the model,
effort and how many requested reviews run at once through the settings route.
A save replaces all three; a refused one shows the route's reason and leaves
the form as typed. There is no API key field.
