The gear popover learns the admin form's conventions: an instanceSchema
field's `group` starts a labeled subsection, `help` puts a line of guidance
under a control, and a manifest `instanceGroups[name]` adds
{ collapsed, columns, help } for that group (rendered as <details> with a
grid body; container queries drop to two or one column in narrow tiles).
/api/modules now exposes instanceGroups. Lets a module keep a long
show/hide checklist per tile — where display choices belong — without
the popover turning into a scroll of thirty loose checkboxes.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
