The HistoryList clear button hand-rolled the same `.icon-btn danger`
styles that were extracted into the shared IconButton component one
commit earlier — the exact duplication that refactor targeted. Swap it
for <IconButton variant="danger">; data-testid/aria pass through the
component's {...rest} spread so behaviour is unchanged.
Both callers also passed an emptyText equal to the prop's default; drop
the overrides so the default lives in one place.
No behaviour change, so no version bump.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
4fb98e4a1e