Top Up Balance logic and Added fixes for routing

frontend/pweb/lib/pages/wallet_top_up/page.dart

@@ -0,0 +1,44 @@
+import 'package:flutter/material.dart';
+
+import 'package:provider/provider.dart';
+
+import 'package:pweb/pages/wallet_top_up/content.dart';
+import 'package:pweb/providers/wallets.dart';
+
+import 'package:pweb/generated/i18n/app_localizations.dart';
+
+
+class WalletTopUpPage extends StatelessWidget {
+  final VoidCallback onBack;
+
+  const WalletTopUpPage({super.key, required this.onBack});
+
+  @override
+  Widget build(BuildContext context) {
+    final loc = AppLocalizations.of(context)!;
+
+    return Consumer<WalletsProvider>(
+      builder: (context, provider, child) {
+        if (provider.isLoading) {
+          return const Center(child: CircularProgressIndicator());
+        }
+
+        if (provider.error != null) {
+          return Center(
+            child: Text(loc.notificationError(provider.error.toString())),
+          );
+        }
+
+        final wallet = provider.selectedWallet;
+        if (wallet == null) {
+          return Center(child: Text(loc.noWalletSelected));
+        }
+
+        return WalletTopUpContent(
+          wallet: wallet,
+          onBack: onBack,
+        );
+      },
+    );
+  }
+}