fix(referenzen): add cleanLocation helper to resolve compilation and linting errors

app/[locale]/referenzen/page.tsx

@@ -34,6 +34,17 @@ export async function generateMetadata({ params }: PageProps): Promise<Metadata>
   };
 }
 
+function cleanLocation(location?: string): string {
+  if (!location) return '';
+  // Remove 5 digit postal codes
+  let cleaned = location.replace(/\b\d{5}\b/g, '');
+  // Clean up multiple spaces, slashes and commas
+  cleaned = cleaned.replace(/\s*,\s*/g, ', ').replace(/\s*\/\s*/g, ' / ').trim();
+  // Remove leading/trailing slash/comma residues
+  cleaned = cleaned.replace(/^[,/\s]+|[,/\s]+$/g, '').trim();
+  return cleaned || location;
+}
+
 export default async function ReferenzenOverview(props: { params: Promise<{ locale: string }> }) {
   const { locale } = await props.params;
   setRequestLocale(locale);