corrected time calculation

lib/screens/monthly_view.dart

@@ -316,9 +316,11 @@ class _MonthlyViewState extends State<MonthlyView> {
       'T': _days.where((d) => d.code == 'T').length,
     };
 
+    final startMinutes = _monthStartInfo?.startMinutes ?? 0;
     final correctionMin = _monthStartInfo?.correctionMinutes ?? 0;
-    final nextCarryMin =
-        cumulative.isNotEmpty ? cumulative.last : _carryBaseMinutes;
+    final overtimeMin = _monthStartInfo?.overtimeMinutes ?? 0;
+    final saldoMin = istTotal - sollTotal;
+    final nextCarryMin = startMinutes + correctionMin + saldoMin - overtimeMin;
 
     final rows = List<DataRow>.generate(_days.length, (i) {
       final day = effectiveDays[i];
@@ -438,12 +440,12 @@ class _MonthlyViewState extends State<MonthlyView> {
         _MonthlySummaryFooter(
           month: _monthStart,
           fontSize: _fontSize,
-          uebertragStartText: minutesToSignedHHMM(_carryBaseMinutes),
+          uebertragStartText: minutesToSignedHHMM(startMinutes),
           sollText: minutesToHHMM(sollTotal),
           istText: minutesToHHMM(istTotal),
           correctionText: minutesToSignedHHMM(correctionMin),
-          saldoText: minutesToSignedHHMM(istTotal - sollTotal),
-          paidOvertimeText: '—',
+          saldoText: minutesToSignedHHMM(saldoMin),
+          paidOvertimeText: minutesToSignedHHMM(overtimeMin),
           uebertragNextText: minutesToSignedHHMM(nextCarryMin),
           restUrlaubText: '$startVacation',
           urlaubUebertragText: '$vacationCarry',