Header from @kuppwest/apple-clean. Use via `window.KuppwestAppleClean.Header` (bundle loaded from the root `_ds_bundle.js`). Wrap the tree in `<Page>` (full provider chain in README.md — components read theme/i18n from that context).

Centered page header (`.kwac-header`): the bold wordmark (`.kwac-mark`) over a
small uppercase, letter-spaced tagline (`.kwac-header-sub`). No logo image, no
navigation. Follows `Summary`, precedes `VehicleBar`.

## Props

```ts
interface HeaderProps {
  /** Brand wordmark, plain bold type. Defaults to "Kupp-west". */
  brand?: string;
  /** Small uppercase tagline under the wordmark, e.g. "Anhängerkupplungen & Elektrosätze". */
  tagline?: string;
}
```