feat(flutter): 应用浅色暖橙视觉主题

lib/pages/wallet/wallet_page.dart

@@ -44,7 +44,7 @@ class _WalletPageState extends State<WalletPage> {
     final l10n = AppLocalizations.of(context)!;
     final wallet = context.watch<WalletController>();
     return Theme(
-      data: AppTheme.dark(),
+      data: AppTheme.light(),
       child: Scaffold(
         key: const Key('wallet-page'),
         backgroundColor: AppColors.ink,
@@ -188,7 +188,7 @@ class _BalanceHero extends StatelessWidget {
         gradient: const LinearGradient(
           begin: Alignment.topLeft,
           end: Alignment.bottomRight,
-          colors: [Color(0xFF2B2116), Color(0xFF17171D)],
+          colors: [AppColors.goldCard, AppColors.card],
         ),
         border: Border.all(color: AppColors.gold.withValues(alpha: 0.35)),
         boxShadow: [