Multiple Wallet support, history of each wallet and updated payment page

frontend/pweb/lib/providers/payment_flow_provider.dart

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+import 'package:flutter/foundation.dart';
+
+import 'package:pshared/models/payment/type.dart';
+import 'package:pshared/models/recipient/recipient.dart';
+
+import 'package:pweb/providers/page_selector.dart';
+
+
+class PaymentFlowProvider extends ChangeNotifier {
+  PaymentType _selectedType;
+  Object? _manualPaymentData;
+
+  PaymentFlowProvider({
+    required PaymentType initialType,
+  }) : _selectedType = initialType;
+
+  PaymentType get selectedType => _selectedType;
+  Object? get manualPaymentData => _manualPaymentData;
+
+  void syncWithSelector(PageSelectorProvider selector) {
+    final recipient = selector.selectedRecipient;
+    final resolvedType = _resolveSelectedType(selector, recipient);
+
+    var hasChanges = false;
+    if (resolvedType != _selectedType) {
+      _selectedType = resolvedType;
+      hasChanges = true;
+    }
+
+    if (recipient != null && _manualPaymentData != null) {
+      _manualPaymentData = null;
+      hasChanges = true;
+    }
+
+    if (hasChanges) notifyListeners();
+  }
+
+  void reset(PageSelectorProvider selector) {
+    _selectedType = selector.getDefaultPaymentType();
+    _manualPaymentData = null;
+    notifyListeners();
+  }
+
+  void selectType(PaymentType type, {bool resetManualData = false}) {
+    if (_selectedType == type && (!resetManualData || _manualPaymentData == null)) {
+      return;
+    }
+
+    _selectedType = type;
+    if (resetManualData) {
+      _manualPaymentData = null;
+    }
+    notifyListeners();
+  }
+
+  void setManualPaymentData(Object? data) {
+    _manualPaymentData = data;
+    notifyListeners();
+  }
+
+  PaymentType _resolveSelectedType(
+    PageSelectorProvider selector,
+    Recipient? recipient,
+  ) {
+    final available = selector.getAvailablePaymentTypes();
+    final current = _selectedType;
+
+    if (recipient == null) {
+      return current;
+    }
+
+    if (available.keys.contains(current)) {
+      return current;
+    }
+
+    return selector.getDefaultPaymentType();
+  }
+}