feat: amélioration majeure des tests - ajout de 45 nouveaux tests et correction des erreurs de linting

src/components/base/ErrorDisplay.tsx

@@ -8,7 +8,7 @@ export function ErrorDisplay({ error, className = "" }: ErrorDisplayProps) {
   
   return (
     <div className={`p-3 bg-red-50 dark:bg-red-900/20 border border-red-200 dark:border-red-800 rounded-lg ${className}`}>
-      <p className="text-sm text-red-600 dark:text-red-400">{error}</p>
+      <p className="text-sm text-red-600 dark:text-red-400" role="alert">{error}</p>
     </div>
   );
 }