Replace panel tileKey with a direct color prop.

Drop theme panelTiles keys and the ArticleView update callback wiring.

src/components/article/boxes/ArticleViewLists.jsx

@@ -39,7 +39,7 @@ export default class ArticleViewLists extends Component {
   render() {
     const { article: articleData } = this.props;
     return (
-      <PanelTile wide={1} minHeight={200}>
+      <PanelTile wide={1} minHeight={200} color="#fbcfe8">
         <RelationLine label="Vaterartikel" active={articleData.childCount > 0}>
           {articleData.childCount}
         </RelationLine>