redesigned payment page + a lot of fixes

frontend/pweb/lib/controllers/payments/details.dart

@@ -0,0 +1,62 @@
+import 'package:flutter/foundation.dart';
+
+import 'package:pshared/models/payment/payment.dart';
+import 'package:pshared/models/payment/status.dart';
+import 'package:pshared/provider/payment/payments.dart';
+
+import 'package:pweb/utils/report/payment_mapper.dart';
+
+
+class PaymentDetailsController extends ChangeNotifier {
+  PaymentDetailsController({required String paymentId})
+      : _paymentId = paymentId;
+
+  PaymentsProvider? _payments;
+  String _paymentId;
+  Payment? _payment;
+
+  String get paymentId => _paymentId;
+  Payment? get payment => _payment;
+  bool get isLoading => _payments?.isLoading ?? false;
+  Exception? get error => _payments?.error;
+
+  bool get canDownload {
+    final current = _payment;
+    if (current == null) return false;
+    final status = statusFromPayment(current);
+    final paymentRef = current.paymentRef ?? '';
+    return status == OperationStatus.success &&
+        paymentRef.trim().isNotEmpty;
+  }
+
+  void update(PaymentsProvider provider, String paymentId) {
+    if (_paymentId != paymentId) {
+      _paymentId = paymentId;
+    }
+
+    if (!identical(_payments, provider)) {
+      _payments = provider;
+    }
+
+    _rebuild();
+  }
+
+  Future<void> refresh() async {
+    await _payments?.refresh();
+  }
+
+  void _rebuild() {
+    _payment = _findPayment(_payments?.payments ?? const [], _paymentId);
+    notifyListeners();
+  }
+
+  Payment? _findPayment(List<Payment> payments, String paymentId) {
+    final trimmed = paymentId.trim();
+    if (trimmed.isEmpty) return null;
+    for (final payment in payments) {
+      if (payment.paymentRef == trimmed) return payment;
+      if (payment.idempotencyKey == trimmed) return payment;
+    }
+    return null;
+  }
+}