improvement: updated toasts. no invisible toast anymore.

frontend/src/components/ui/lab/CasesPage.tsx

@@ -3,7 +3,6 @@
 import { useCallback, useEffect, useMemo, useState } from 'react';
 import { useSearchParams } from 'next/navigation';
 import { useTranslations } from 'next-intl';
-import { ToastStack } from '@/components/ui/shared/Toast';
 import { getUserFacingError } from '@/components/shared/formatApiError';
 import { useAuth } from '@/lib/hooks/useAuth';
 import { useToast } from '@/lib/hooks/useToast';
@@ -466,7 +465,6 @@ export function CasesPage() {
         </section>
       </div>
 
-      <ToastStack {...toast.messages} />
     </div>
   );
 }