fix: March card header shows prorated fund (136h/17 dnů) matching the +/- values

Card header, per-user +/-, progress bar, and yearly table all now
use the same prorated fund_to_date for the current month.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/admin/pages/AttendanceBalances.tsx

@@ -451,7 +451,7 @@ export default function AttendanceBalances() {
                         )}
                       </h3>
                       <span className="text-secondary" style={{ fontSize: '12px' }}>
-                        {monthData.fund}h ({monthData.business_days} dnů)
+                        {(monthData as any).fund_to_date ?? monthData.fund}h ({Math.round(((monthData as any).fund_to_date ?? monthData.fund) / 8)} dnů)
                       </span>
                     </div>
                     <div style={{ display: 'flex', flexDirection: 'column', gap: '0.375rem' }}>