The admin users page wraps four top-level sibling sections inside a
single `bg-container rounded-xl shadow-border-xs p-4` card:
1. description paragraph
2. filter form
3. trials-expiring summary grid
4. families/groups list
5. role descriptions (`settings_section` collapsible → DS::Disclosure :card)
The first three carried their own `mb-6`; the families list and the
role descriptions section had no margin at all, so the families card
sat flush against the role-descriptions card with zero gap — clearly
broken next to the well-spaced upper sections.
Apply spacing at the **layout** level: hoist `space-y-6` onto the
outer container and drop the per-child `mb-6`. All five siblings now
get a consistent 24px gap.
No other admin or settings pages match this exact pattern (single
outer card + multiple sibling sections without parent space-y) — the
settings layout already wraps `<%= yield %>` in `space-y-4`, and other
pages with outer cards (`api_keys/show`, `llm_usages/show`, etc.)
either rely on that layout or carry their own internal `space-y-N`.
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