The members branch was inserting space_members directly from the
browser with user_id: crypto.randomUUID() -- a fabricated id that
violates the auth.users FK (offline members must be user_id NULL) and
bypassed all server-side validation. Now maps columns and calls the
existing admin-gated, Zod-validated, batched importMembers action;
surfaces count + skipped. Dropped the now-unused spaceId prop.
- new components/ui/page-title.tsx (PageHeader/PageTitle/SectionTitle)
- every page heading routed through PageTitle (one source of truth
for the page-title style; identical render)
- members restricted-directory screen now uses the standard
PageHeader bar instead of an off-style mono heading