added ledger as souec of funds for payouts

frontend/pshared/lib/utils/payment/quote_helpers.dart

@@ -4,6 +4,7 @@ import 'package:pshared/models/payment/quote/quote.dart';
 import 'package:pshared/utils/currency.dart';
 import 'package:pshared/utils/money.dart';
 
+
 Money? quoteFeeTotal(PaymentQuote? quote) {
   final preferredCurrency =
       quote?.amounts?.sourcePrincipal?.currency ??
@@ -14,6 +15,36 @@ Money? quoteFeeTotal(PaymentQuote? quote) {
   );
 }
 
+Money? quoteSourceDebitTotal(
+  PaymentQuote? quote, {
+  String? preferredSourceCurrency,
+}) {
+  final sourceDebitTotal = quote?.amounts?.sourceDebitTotal;
+  final preferredCurrency = _normalizeCurrency(
+    preferredSourceCurrency ?? quote?.amounts?.sourcePrincipal?.currency,
+  );
+
+  if (sourceDebitTotal == null) {
+    return _rebuildSourceDebitTotal(
+      quote,
+      preferredSourceCurrency: preferredCurrency,
+    );
+  }
+
+  final debitCurrency = _normalizeCurrency(sourceDebitTotal.currency);
+  if (preferredCurrency == null ||
+      debitCurrency == null ||
+      debitCurrency == preferredCurrency) {
+    return sourceDebitTotal;
+  }
+
+  final rebuilt = _rebuildSourceDebitTotal(
+    quote,
+    preferredSourceCurrency: preferredCurrency,
+  );
+  return rebuilt ?? sourceDebitTotal;
+}
+
 Money? quoteFeeTotalFromLines(
   List<FeeLine>? lines, {
   String? preferredCurrency,
@@ -74,6 +105,44 @@ List<Money> aggregateMoneyByCurrency(Iterable<Money?> values) {
       .toList();
 }
 
+Money? _rebuildSourceDebitTotal(
+  PaymentQuote? quote, {
+  String? preferredSourceCurrency,
+}) {
+  final sourcePrincipal = quote?.amounts?.sourcePrincipal;
+  if (sourcePrincipal == null) return null;
+
+  final principalCurrency = _normalizeCurrency(sourcePrincipal.currency);
+  if (principalCurrency == null) return null;
+  if (preferredSourceCurrency != null &&
+      principalCurrency != preferredSourceCurrency) {
+    return null;
+  }
+
+  final principalAmount = parseMoneyAmount(
+    sourcePrincipal.amount,
+    fallback: double.nan,
+  );
+  if (principalAmount.isNaN) return null;
+
+  double totalAmount = principalAmount;
+  final fee = quoteFeeTotalFromLines(
+    quote?.fees?.lines,
+    preferredCurrency: principalCurrency,
+  );
+  if (fee != null && _normalizeCurrency(fee.currency) == principalCurrency) {
+    final feeAmount = parseMoneyAmount(fee.amount, fallback: double.nan);
+    if (!feeAmount.isNaN) {
+      totalAmount += feeAmount;
+    }
+  }
+
+  return Money(
+    amount: amountToString(totalAmount),
+    currency: principalCurrency,
+  );
+}
+
 double _lineSign(String? side) {
   final normalized = side?.trim().toLowerCase() ?? '';
   switch (normalized) {