fix(test): resolve typescript compiler error in e2e test

tests/contact-form.e2e.test.ts

@@ -34,7 +34,9 @@ describe('Contact Form E2E', () => {
     if (!isServerUp) skip();
 
     page.on('console', (msg) => console.log('PAGE LOG:', msg.text()));
-    page.on('pageerror', (err) => console.error('PAGE ERROR:', err.message));
+    page.on('pageerror', (err) =>
+      console.error('PAGE ERROR:', err instanceof Error ? err.message : String(err)),
+    );
 
     await page.goto(`${BASE_URL}/de/kontakt`);