style(app): 格式化并拆分长函数

lib/pages/wallet/wallet_page.dart

@@ -90,9 +90,8 @@ class _WalletPageState extends State<WalletPage> {
   void _openRecharge(WalletController wallet) {
     Navigator.of(context).push(
       MaterialPageRoute<void>(
-        builder: (_) => RechargePage(
-          onPurchased: () => unawaited(wallet.load()),
-        ),
+        builder: (_) =>
+            RechargePage(onPurchased: () => unawaited(wallet.load())),
       ),
     );
   }
@@ -320,7 +319,9 @@ class _LedgerTile extends StatelessWidget {
   Widget build(BuildContext context) {
     final positive = entry.changeAmount >= 0;
     final color = positive ? AppColors.success : AppColors.accent;
-    final amount = positive ? '+${entry.changeAmount}' : '${entry.changeAmount}';
+    final amount = positive
+        ? '+${entry.changeAmount}'
+        : '${entry.changeAmount}';
     return Container(
       padding: const EdgeInsets.all(12),
       decoration: BoxDecoration(