small fixes

frontend/pweb/lib/pages/dashboard/payouts/amount.dart

@@ -4,6 +4,7 @@ import 'package:provider/provider.dart';
 
 import 'package:pshared/provider/payment/amount.dart';
 import 'package:pshared/utils/currency.dart';
+import 'package:pshared/utils/money.dart';
 
 import 'package:pweb/generated/i18n/app_localizations.dart';
 
@@ -32,7 +33,13 @@ class _PaymentAmountWidgetState extends State<PaymentAmountWidget> {
     super.dispose();
   }
 
-  double? _parseAmount(String value) => double.tryParse(value.replaceAll(',', '.'));
+  double? _parseAmount(String value) {
+    final parsed = parseMoneyAmount(
+      value.replaceAll(',', '.'),
+      fallback: double.nan,
+    );
+    return parsed.isNaN ? null : parsed;
+  }
 
   void _syncTextWithAmount(double amount) {
     final parsedText = _parseAmount(_controller.text);