Shell 930 + Validation*Field, dirty-state, StaffUserFormModal sous widgets/dashboard/ ; retire AdminUserFormDialog. Co-authored-by: Cursor <cursoragent@cursor.com>
Déplace les panels/wizards/validation/common partagés hors de widgets/admin/ ; ne conserve que AdminManagementWidget (variante A). Co-authored-by: Cursor <cursoragent@cursor.com>