Changes

Product variants: master (IsSummary) articles + ParentId grouping, Varianten card and list column; Hess/Livipur demo catalog tooling

Docs: product variant model recipe, Hess demo tooling, Jenkins trigger crumb note

Variants: read ParentId under its REST key (parentId)

Hess catalog: distinct variation names (append missing attribute values)

Security keys: Nuxt UI enrol wizard + revoke dialog, working grid actions, phone layout

- /users/security-keys: real Vue cell renderers (user + actions) with handlers via
  cellRendererParams — the shared AgGrid cellClick is selection-changed and never fired the
  Revoke/user-link in raw-HTML cells; 44px rows, stats, search, UIcon icons
- Phone (< 900px): grouped employee cards, sticky "Enrol key" button, full-screen wizard with
  NFC/USB hints per device (Android/iOS/Windows/macOS/app)
- Shared UsersSecurityKeyEnrolModal (details → tap → done/error, UForm validation, employee
  picker with key counts, auto "YubiKey <first name>", cancel aborts at every stage) and
  UsersSecurityKeyRevokeModal (key/user/dates, last-key warning, toasts) used by the overview,
  the profile panel and the user-edit panel; UsersSecurityKeys.vue rebuilt on them
- useSecurityKeyFormat (relative dates, transports, initials, WebAuthn error texts),
  useWebAuthn.cancelCeremony/isNativeApp + register({ isCancelled }), AgGrid rowHeight prop
- Translations en/de/es (+ ne fallback); recipes: webauthn UI, icon + Tailwind colour gaps