changed color theme to be black and added the ability to enter the amount in the recipient’s currency

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

@@ -22,6 +22,8 @@ import 'package:pshared/utils/currency.dart';
 import 'package:pshared/utils/payment/fx_helpers.dart';
 
 class QuotationIntentBuilder {
+  static const String _settlementCurrency = 'RUB';
+
   PaymentIntent? build({
     required PaymentAmountProvider payment,
     required WalletsController wallets,
@@ -39,10 +41,12 @@ class QuotationIntentBuilder {
       data: paymentData,
     );
     final sourceCurrency = currencyCodeToString(selectedWallet.currency);
+    final amountCurrency = payment.settlementMode == SettlementMode.fixReceived
+        ? _settlementCurrency
+        : sourceCurrency;
     final amount = Money(
       amount: payment.amount.toString(),
-      // TODO: adapt to possible other sources
-      currency: sourceCurrency,
+      currency: amountCurrency,
     );
     final isCryptoToCrypto =
         paymentData is CryptoAddressPaymentMethod &&
@@ -50,7 +54,7 @@ class QuotationIntentBuilder {
             amount.currency;
     final fxIntent = FxIntentHelper.buildSellBaseBuyQuote(
       baseCurrency: sourceCurrency,
-      quoteCurrency: 'RUB', // TODO: exentd target currencies
+      quoteCurrency: _settlementCurrency, // TODO: exentd target currencies
       enabled: !isCryptoToCrypto,
     );
     return PaymentIntent(
@@ -68,7 +72,7 @@ class QuotationIntentBuilder {
       feeTreatment: payment.payerCoversFee
           ? FeeTreatment.addToSource
           : FeeTreatment.deductFromDestination,
-      settlementMode: SettlementMode.fixSource,
+      settlementMode: payment.settlementMode,
       customer: customer,
     );
   }