Review follow-ups: the audit row's expand was mouse-only (onclick on a bare
<tr>). Move the toggle to a real <button> in the actions cell with
aria-expanded + aria-label so keyboard/AT users can open a row's payload; the
row onclick stays as a mouse convenience (stopPropagation avoids a double
toggle). Also simplify a no-op `step={'%' ? '1' : '1'}` to step="1" on the
threshold inputs.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>