Updated composer.json to remove the translation package and add the stopwatch package. Cleaned up configuration files by removing unused mailer, notifier, translation, and ux_turbo settings, and adjusted CSRF protection settings. Modified messenger.yaml to remove email message routing.

config/packages/csrf.yaml

@@ -5,6 +5,7 @@ framework:
             token_id: submit
 
     csrf_protection:
+        check_header: true
         stateless_token_ids:
             - submit
             - authenticate