ledger top up functionality and few small fixes for project architechture and design

frontend/pweb/lib/models/dashboard/balance_item.dart

@@ -0,0 +1,26 @@
+import 'package:pshared/models/ledger/account.dart';
+import 'package:pshared/models/payment/wallet.dart';
+
+sealed class BalanceItem {
+  const BalanceItem();
+
+  const factory BalanceItem.wallet(Wallet wallet) = WalletBalanceItem;
+  const factory BalanceItem.ledger(LedgerAccount account) = LedgerBalanceItem;
+  const factory BalanceItem.addAction() = AddBalanceActionItem;
+}
+
+final class WalletBalanceItem extends BalanceItem {
+  final Wallet wallet;
+
+  const WalletBalanceItem(this.wallet);
+}
+
+final class LedgerBalanceItem extends BalanceItem {
+  final LedgerAccount account;
+
+  const LedgerBalanceItem(this.account);
+}
+
+final class AddBalanceActionItem extends BalanceItem {
+  const AddBalanceActionItem();
+}