Manage page — lists the current user's personal dashboards, all shared
(system) dashboards, and any role-scoped dashboards for the user's roles.
Admins can create a personal, shared (system), or by-role dashboard,
clone any visible dashboard into a private editable copy, open the builder,
or delete (own personal ones + shared/role ones).
Admin layout, sidebar, and the @phoenix_kit_current_user / _scope assigns
are injected by PhoenixKit's on_mount hooks.