WIP: integration with ledger

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

@@ -2,15 +2,16 @@ import 'package:flutter/material.dart';
 
 import 'package:pweb/generated/i18n/app_localizations.dart';
 
-
 class WalletTopUpHeader extends StatelessWidget {
   final VoidCallback onBack;
   final String? tokenSymbol;
+  final String? sourceLabel;
 
   const WalletTopUpHeader({
     super.key,
     required this.onBack,
     this.tokenSymbol,
+    this.sourceLabel,
   });
 
   @override
@@ -20,24 +21,18 @@ class WalletTopUpHeader extends StatelessWidget {
     final symbol = tokenSymbol?.trim();
 
     final subtitle = [
-      loc.paymentTypeCryptoWallet,
+      sourceLabel ?? loc.paymentTypeCryptoWallet,
       if (symbol != null && symbol.isNotEmpty) symbol,
     ].join(' · ');
 
     return Row(
       children: [
-        IconButton(
-          icon: const Icon(Icons.arrow_back),
-          onPressed: onBack,
-        ),
+        IconButton(icon: const Icon(Icons.arrow_back), onPressed: onBack),
         const SizedBox(width: 8),
         Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            Text(
-              loc.walletTopUpTitle,
-              style: theme.textTheme.titleLarge,
-            ),
+            Text(loc.walletTopUpTitle, style: theme.textTheme.titleLarge),
             const SizedBox(height: 4),
             Text(
               subtitle,