- new components/ui/confirm.tsx: ConfirmProvider + useConfirm() built
on the existing Radix alert-dialog (focus trap, ESC, aria for free)
- wired once into the app layout
- all 13 native window.confirm() delete/remove guards now use the
styled, accessible confirm with a destructive action button
- 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