The earlier base.html edit only affected templates that extend base.html
(login.html via base_login.html). Most pages (dashboard, catalog,
admin_tables, admin_permissions, activity_center, corporate_memory, ...)
are standalone templates with their own <body>, so the badge never showed.
Fix: extracted the badge + fetch script into _version_badge.html partial,
included it before </body> in every full-page template. Consistent across
login, dashboard, admin, catalog, etc.
