ci: enforce flutter/biome format checks and fix front lint violations

userfront/lib/core/i18n/locale_utils.dart

@@ -76,7 +76,7 @@ String buildLocalizedPath(String localeCode, Uri uri) {
     }
   }
   final newPath = '/${[localeCode, ...restSegments].join('/')}';
-  
+
   // Return only the path and query part to avoid GoRouter confusion with full URLs
   final newUri = uri.replace(path: newPath);
   String result = newUri.path;