redesigned payment page + a lot of fixes

frontend/pshared/lib/controllers/balance_mask/wallets.dart

@@ -1,7 +1,5 @@
 import 'package:flutter/foundation.dart';
 
-import 'package:collection/collection.dart';
-
 import 'package:pshared/models/payment/wallet.dart';
 import 'package:pshared/provider/payment/wallets.dart';
 
@@ -15,6 +13,9 @@ class WalletsController with ChangeNotifier {
   final Set<String> _maskedBalanceWalletRefs = <String>{};
   Set<String> _knownWalletRefs = <String>{};
 
+  List<Wallet> _walletsList = <Wallet>[];
+  Map<String, Wallet> _walletsById = <String, Wallet>{};
+
   String? _selectedWalletRef;
 
   bool get isLoading => _wallets.isLoading;
@@ -33,8 +34,11 @@ class WalletsController with ChangeNotifier {
       _selectedWalletRef = null;
     }
 
+    _walletsById = _uniqueWalletsById(wallets.wallets);
+    _walletsList = _walletsById.values.toList(growable: false);
+
     // Remove ids that no longer exist
-    final ids = wallets.wallets.map((w) => w.id).toSet();
+    final ids = _walletsById.keys.toSet();
     _maskedBalanceWalletRefs.removeWhere((id) => !ids.contains(id));
 
     final newIds = ids.difference(_knownWalletRefs);
@@ -45,13 +49,13 @@ class WalletsController with ChangeNotifier {
 
     _selectedWalletRef = _resolveSelectedId(
       currentRef: _selectedWalletRef,
-      wallets: wallets.wallets,
+      wallets: _walletsList,
     );
 
     notifyListeners();
   }
 
-  List<Wallet> get wallets => _wallets.wallets;
+  List<Wallet> get wallets => _walletsList;
 
   bool isBalanceMasked(String walletRef) => _maskedBalanceWalletRefs.contains(walletRef);
   bool isBalanceVisible(String walletRef) => !isBalanceMasked(walletRef);
@@ -62,7 +66,7 @@ class WalletsController with ChangeNotifier {
   Wallet? get selectedWallet {
     final id = _selectedWalletRef;
     if (id == null) return null;
-    return wallets.firstWhereOrNull((w) => w.id == id);
+    return _walletsById[id];
   }
 
   String? get selectedWalletRef => _selectedWalletRef;
@@ -103,4 +107,12 @@ class WalletsController with ChangeNotifier {
     // Fallback to the first wallet
     return wallets.first.id;
   }
+
+  Map<String, Wallet> _uniqueWalletsById(List<Wallet> wallets) {
+    final result = <String, Wallet>{};
+    for (final wallet in wallets) {
+      result.putIfAbsent(wallet.id, () => wallet);
+    }
+    return result;
+  }
 }