redesigned payment page + a lot of fixes

frontend/pweb/lib/pages/payout_page/send/page.dart

@@ -0,0 +1,65 @@
+import 'package:flutter/material.dart';
+
+import 'package:pshared/models/payment/type.dart';
+import 'package:pshared/models/recipient/recipient.dart';
+
+import 'package:pweb/widgets/sidebar/destinations.dart';
+import 'package:pweb/controllers/payments/page_ui.dart';
+import 'package:pweb/pages/payout_page/send/page_handlers.dart';
+import 'package:pweb/pages/payout_page/send/page_view.dart';
+
+
+class PaymentPage extends StatefulWidget {
+  final ValueChanged<Recipient?>? onBack;
+  final PaymentType? initialPaymentType;
+  final PayoutDestination fallbackDestination;
+
+  const PaymentPage({
+    super.key,
+    this.onBack,
+    this.initialPaymentType,
+    this.fallbackDestination = PayoutDestination.dashboard,
+  });
+
+  @override
+  State<PaymentPage> createState() => _PaymentPageState();
+}
+
+class _PaymentPageState extends State<PaymentPage> {
+  late final PaymentPageUiController _uiController;
+
+  @override
+  void initState() {
+    super.initState();
+    _uiController = PaymentPageUiController();
+
+    WidgetsBinding.instance.addPostFrameCallback(
+      (_) => initializePaymentPage(context, widget.initialPaymentType),
+    );
+  }
+
+  @override
+  void dispose() {
+    _uiController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return PaymentPageView(
+      uiController: _uiController,
+      onBack: widget.onBack,
+      fallbackDestination: widget.fallbackDestination,
+      onSearchChanged: (query) => handleSearchChanged(_uiController, query),
+      onRecipientSelected: (recipient) =>
+          handleRecipientSelected(context, _uiController, recipient),
+      onRecipientCleared: () => handleRecipientCleared(context, _uiController),
+      onSend: () => handleSendPayment(
+        state: this,
+        fallbackDestination: widget.fallbackDestination,
+      ),
+      onAddRecipient: () => handleAddRecipient(context),
+      onAddPaymentMethod: () => handleAddPaymentMethod(context),
+    );
+  }
+}