redesigned payment page + a lot of fixes

frontend/pweb/lib/controllers/payouts/multi_quotation.dart

@@ -0,0 +1,37 @@
+import 'package:flutter/foundation.dart';
+
+import 'package:pshared/provider/payment/multiple/quotation.dart';
+
+
+class MultiQuotationController extends ChangeNotifier {
+  MultiQuotationProvider? _quotation;
+
+  void update(MultiQuotationProvider quotation) {
+    if (identical(_quotation, quotation)) return;
+    _quotation?.removeListener(_handleQuotationChanged);
+    _quotation = quotation;
+    _quotation?.addListener(_handleQuotationChanged);
+    _handleQuotationChanged();
+  }
+
+  bool get isLoading => _quotation?.isLoading ?? false;
+  Exception? get error => _quotation?.error;
+  bool get canRefresh => _quotation?.canRefresh ?? false;
+  bool get isReady => _quotation?.isReady ?? false;
+
+  DateTime? get quoteExpiresAt => _quotation?.quoteExpiresAt;
+
+  void refreshQuotation() {
+    _quotation?.refreshQuotation();
+  }
+
+  void _handleQuotationChanged() {
+    notifyListeners();
+  }
+
+  @override
+  void dispose() {
+    _quotation?.removeListener(_handleQuotationChanged);
+    super.dispose();
+  }
+}