Fix: Passt an, dass bei monatlichen Transaktionen der Tag entsprechend hergenommen wird

lib/Tasks/generate_transactions_task.dart

@@ -67,15 +67,51 @@ class GenerateTransactionsTask extends Task {
         case TimeFrameEnum.weekly:
           newTransactionDate = lastTransactionDate.add(const Duration(days: 7));
         case TimeFrameEnum.monthly:
-          newTransactionDate = DateUtils.addMonthsToMonthDate(
+          final DateTime monthDate = DateUtils.addMonthsToMonthDate(
             lastTransactionDate,
             1,
           );
+
+          final int day =
+              recurringTransaction.startDate!.day <
+                  DateUtils.getDaysInMonth(
+                    monthDate.year,
+                    monthDate.day,
+                  )
+              ? recurringTransaction.startDate!.day
+              : DateUtils.getDaysInMonth(
+                monthDate.year,
+                monthDate.month,
+                );
+
+          newTransactionDate = DateTime(
+            monthDate.year,
+            monthDate.month,
+            day,
+          );
         case TimeFrameEnum.yearly:
-          newTransactionDate = DateUtils.addMonthsToMonthDate(
+          final DateTime monthDate = DateUtils.addMonthsToMonthDate(
             lastTransactionDate,
             12,
           );
+
+          final int day =
+          recurringTransaction.startDate!.day <
+              DateUtils.getDaysInMonth(
+                monthDate.year,
+                monthDate.day,
+              )
+              ? recurringTransaction.startDate!.day
+              : DateUtils.getDaysInMonth(
+            monthDate.year,
+            monthDate.month,
+          );
+
+          newTransactionDate = DateTime(
+            monthDate.year,
+            monthDate.month,
+            day,
+          );
       }
     } else {
       newTransactionDate = recurringTransaction.startDate!;