Add Recharts bar charts to Today dashboard summary.

Extend the Today summary API with treatment mix and workflow task breakdowns, and render permission-aware chart cards on the Today page using Recharts.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/app/[locale]/(dashboard)/today/page.tsx

@@ -4,6 +4,7 @@ import { useTranslations } from 'next-intl';
 import { Link } from '@/i18n/navigation';
 import { useAuth } from '@/lib/hooks/useAuth';
 import { TodayKpiGrid } from '@/components/today/TodayKpiGrid';
+import { TodayChartsSection } from '@/components/today/TodayChartsSection';
 import { useTodaySummary } from '@/lib/hooks/useTodaySummary';
 import { formatApiErrorMessage } from '@/components/shared/formatApiError';
 
@@ -39,6 +40,8 @@ export default function TodayPage() {
       ) : null}
 
       <TodayKpiGrid widgets={data?.widgets ?? {}} loading={loading} />
+
+      <TodayChartsSection charts={data?.charts ?? {}} loading={loading} />
     </div>
   );
 }