Sync styleguide 2026.05.18.1

docs/styleguide/styleguide.css

@@ -15,6 +15,7 @@
 @import "./styles/30-layouts-card-list-page.css";
 @import "./styles/33-layouts-vsf-list-detailseite.css";
 @import "./styles/34-layouts-vsf-listen-uebersicht-seite-v2.css";
+@import "./styles/35-layouts-vsf-register-step-1.css";
 @import "./styles/31-patterns-text-layouts.css";
 @import "./styles/32-patterns-card-group-keyboard-nav.css";
 @import "./styles/40-components-cards.css";