small fixes

frontend/pweb/lib/utils/payment/multiple_csv_parser.dart

@@ -1,3 +1,5 @@
+import 'package:pshared/utils/money.dart';
+
 import 'package:pweb/models/multiple_payouts/csv_row.dart';
 
 
@@ -79,8 +81,8 @@ class MultipleCsvParser {
         throw FormatException('CSV row ${i + 1}: amount is required');
       }
 
-      final parsedAmount = double.tryParse(amount);
-      if (parsedAmount == null || parsedAmount <= 0) {
+      final parsedAmount = parseMoneyAmount(amount, fallback: double.nan);
+      if (parsedAmount.isNaN || parsedAmount <= 0) {
         throw FormatException(
           'CSV row ${i + 1}: amount must be greater than 0',
         );