added ledger as souec of funds for payouts

frontend/pshared/lib/provider/payment/quotation/intent_builder.dart

@@ -1,13 +1,17 @@
-import 'package:pshared/controllers/balance_mask/wallets.dart';
+import 'package:pshared/controllers/payment/source.dart';
 import 'package:pshared/models/payment/asset.dart';
 import 'package:pshared/models/payment/chain_network.dart';
 import 'package:pshared/models/payment/customer.dart';
+import 'package:pshared/models/payment/currency_pair.dart';
 import 'package:pshared/models/payment/fees/treatment.dart';
+import 'package:pshared/models/payment/fx/intent.dart';
+import 'package:pshared/models/payment/fx/side.dart';
 import 'package:pshared/models/payment/kind.dart';
 import 'package:pshared/models/payment/methods/card.dart';
 import 'package:pshared/models/payment/methods/crypto_address.dart';
 import 'package:pshared/models/payment/methods/data.dart';
 import 'package:pshared/models/payment/methods/iban.dart';
+import 'package:pshared/models/payment/methods/ledger.dart';
 import 'package:pshared/models/payment/methods/managed_wallet.dart';
 import 'package:pshared/models/payment/methods/russian_bank.dart';
 import 'package:pshared/models/payment/methods/type.dart';
@@ -18,7 +22,6 @@ import 'package:pshared/models/recipient/recipient.dart';
 import 'package:pshared/provider/payment/amount.dart';
 import 'package:pshared/provider/payment/flow.dart';
 import 'package:pshared/provider/recipient/provider.dart';
-import 'package:pshared/utils/currency.dart';
 import 'package:pshared/utils/payment/fx_helpers.dart';
 
 class QuotationIntentBuilder {
@@ -26,21 +29,23 @@ class QuotationIntentBuilder {
 
   PaymentIntent? build({
     required PaymentAmountProvider payment,
-    required WalletsController wallets,
+    required PaymentSourceController source,
     required PaymentFlowProvider flow,
     required RecipientsProvider recipients,
   }) {
-    final selectedWallet = wallets.selectedWallet;
+    final sourceMethod = _resolveSourceMethod(source);
+    final sourceCurrency = source.selectedCurrencyCode;
     final paymentData = flow.selectedPaymentData;
     final selectedMethod = flow.selectedMethod;
-    if (selectedWallet == null || paymentData == null) return null;
+    if (sourceMethod == null || sourceCurrency == null || paymentData == null) {
+      return null;
+    }
 
     final customer = _buildCustomer(
       recipient: recipients.currentObject,
       method: selectedMethod,
       data: paymentData,
     );
-    final sourceCurrency = currencyCodeToString(selectedWallet.currency);
     final amountCurrency = payment.settlementMode == SettlementMode.fixReceived
         ? _settlementCurrency
         : sourceCurrency;
@@ -48,26 +53,22 @@ class QuotationIntentBuilder {
       amount: payment.amount.toString(),
       currency: amountCurrency,
     );
+    final isLedgerSource = source.selectedLedgerAccount != null;
     final isCryptoToCrypto =
         paymentData is CryptoAddressPaymentMethod &&
         (paymentData.asset?.tokenSymbol ?? '').trim().toUpperCase() ==
             amount.currency;
-    final fxIntent = FxIntentHelper.buildSellBaseBuyQuote(
-      baseCurrency: sourceCurrency,
-      quoteCurrency: _settlementCurrency, // TODO: exentd target currencies
+    final fxIntent = _buildFxIntent(
+      sourceCurrency: sourceCurrency,
+      settlementMode: payment.settlementMode,
+      isLedgerSource: isLedgerSource,
       enabled: !isCryptoToCrypto,
     );
     return PaymentIntent(
       kind: PaymentKind.payout,
       amount: amount,
       destination: paymentData,
-      source: ManagedWalletPaymentMethod(
-        managedWalletRef: selectedWallet.id,
-        asset: PaymentAsset(
-          tokenSymbol: selectedWallet.tokenSymbol ?? '',
-          chain: selectedWallet.network ?? ChainNetwork.unspecified,
-        ),
-      ),
+      source: sourceMethod,
       fx: fxIntent,
       feeTreatment: payment.payerCoversFee
           ? FeeTreatment.addToSource
@@ -77,6 +78,56 @@ class QuotationIntentBuilder {
     );
   }
 
+  FxIntent? _buildFxIntent({
+    required String sourceCurrency,
+    required SettlementMode settlementMode,
+    required bool isLedgerSource,
+    required bool enabled,
+  }) {
+    if (!enabled) return null;
+
+    // Ledger sources in fix_received mode need explicit reverse side.
+    // BFF maps only settlement currency + fx side, then quotation derives pair.
+    // For ledger this preserves source debit in ledger currency (e.g. USDT).
+    if (isLedgerSource && settlementMode == SettlementMode.fixReceived) {
+      final base = sourceCurrency.trim();
+      final quote = _settlementCurrency;
+      if (base.isEmpty || base.toUpperCase() == quote.toUpperCase()) {
+        return null;
+      }
+      return FxIntent(
+        pair: CurrencyPair(base: base, quote: quote),
+        side: FxSide.buyBaseSellQuote,
+      );
+    }
+
+    return FxIntentHelper.buildSellBaseBuyQuote(
+      baseCurrency: sourceCurrency,
+      quoteCurrency: _settlementCurrency, // TODO: exentd target currencies
+      enabled: true,
+    );
+  }
+
+  PaymentMethodData? _resolveSourceMethod(PaymentSourceController source) {
+    final wallet = source.selectedWallet;
+    if (wallet != null) {
+      return ManagedWalletPaymentMethod(
+        managedWalletRef: wallet.id,
+        asset: PaymentAsset(
+          tokenSymbol: wallet.tokenSymbol ?? '',
+          chain: wallet.network ?? ChainNetwork.unspecified,
+        ),
+      );
+    }
+
+    final ledger = source.selectedLedgerAccount;
+    if (ledger != null) {
+      return LedgerPaymentMethod(ledgerAccountRef: ledger.ledgerAccountRef);
+    }
+
+    return null;
+  }
+
   Customer? _buildCustomer({
     required Recipient? recipient,
     required PaymentMethod? method,