fix(ui): 修复多个UI样式问题

1. 修复 Light Mode 卡片背景色（surfaceCard: #FFFFFF）
2. 修复首页充值按钮颜色（使用主色实心背景+白色文字）
3. 修复'更多'和'资产详情'文字颜色（使用 text-muted）
4. 修复邀请码卡片背景色（使用琥珀色渐变）
5. 修复'复制邀请码'按钮文字颜色（使用 onPrimary）

flutter_monisuo/build/web/flutter_bootstrap.js

@@ -37,6 +37,6 @@ _flutter.buildConfig = {"engineRevision":"e4b8dca3f1b4ede4c30371002441c88c12187e
 
 _flutter.loader.load({
   serviceWorkerSettings: {
-    serviceWorkerVersion: "759579798" /* Flutter's service worker is deprecated and will be removed in a future Flutter release. */
+    serviceWorkerVersion: "3968745925" /* Flutter's service worker is deprecated and will be removed in a future Flutter release. */
   }
 });

flutter_monisuo/lib/core/theme/app_theme_extension.dart

@@ -92,8 +92,8 @@ class AppThemeColors extends ThemeExtension<AppThemeColors> {
 
   /// 浅色主题工厂
   factory AppThemeColors.light() => AppThemeColors(
-        surfaceCard: AppColorScheme.lightSurfaceContainerHigh,
-        surfaceCardHigh: AppColorScheme.lightSurfaceContainerHigh,
+        surfaceCard: AppColorScheme.lightSurfaceLowest,
+        surfaceCardHigh: AppColorScheme.lightSurfaceContainer,
         onSurfaceMuted: AppColorScheme.lightOnSurfaceMuted,
         up: AppColorScheme.lightTertiary,
         upBackground: AppColorScheme.lightTertiary.withValues(alpha: 0.15),

flutter_monisuo/lib/ui/pages/home/home_page.dart

@@ -544,19 +544,18 @@ class _AssetCardState extends State<_AssetCard> {
                     vertical: AppSpacing.xs + 2,
                   ),
                   decoration: BoxDecoration(
-                    color: context.colors.primary.withValues(alpha: 0.1),
+                    color: context.colors.primary,
                     borderRadius: BorderRadius.circular(AppRadius.full),
-                    border: Border.all(color: context.colors.primary.withValues(alpha: 0.2)),
                   ),
                   child: Row(
                     mainAxisSize: MainAxisSize.min,
                     children: [
-                      Icon(Icons.add, size: 14, color: context.colors.primary),
+                      Icon(Icons.add, size: 14, color: context.colors.onPrimary),
                       SizedBox(width: AppSpacing.xs),
                       Text(
                         '充值',
                         style: AppTextStyles.labelLarge(context).copyWith(
-                          color: context.colors.primary,
+                          color: context.colors.onPrimary,
                         ),
                       ),
                     ],
@@ -957,7 +956,7 @@ class _HoldingsSection extends StatelessWidget {
             TextButton(
               onPressed: () {},
               style: TextButton.styleFrom(
-                foregroundColor: context.colors.primary,
+                foregroundColor: context.appColors.onSurfaceMuted,
                 padding: const EdgeInsets.symmetric(horizontal: AppSpacing.sm),
               ),
               child: Row(
@@ -968,7 +967,7 @@ class _HoldingsSection extends StatelessWidget {
                       )),
                   const SizedBox(width: AppSpacing.xs),
                   Icon(LucideIcons.chevronRight,
-                      size: 16, color: context.colors.primary),
+                      size: 16, color: context.appColors.onSurfaceMuted),
                 ],
               ),
             ),

flutter_monisuo/lib/ui/pages/home/hot_coins_section.dart

@@ -24,7 +24,9 @@ class HotCoinsSection extends StatelessWidget {
               ),
               Text(
                 '更多',
-                style: AppTextStyles.bodyMedium(context),
+                style: AppTextStyles.bodyMedium(context).copyWith(
+                  color: context.appColors.onSurfaceMuted,
+                ),
               ),
             ],
           ),

flutter_monisuo/lib/ui/pages/mine/welfare_center_page.dart

@@ -61,19 +61,30 @@ class _WelfareCenterPageState extends State<WelfareCenterPage> {
 
   /// 金色渐变卡片容器
   BoxDecoration _goldGradientDecoration() {
-    final goldAccent = context.appColors.accentPrimary;
+    final isDark = context.isDark;
+    // Light Mode: 琥珀色渐变（从 amber 15% 到深灰 5%）
+    // Dark Mode: 金色渐变
+    final gradientColors = isDark
+        ? [
+            context.appColors.accentPrimary.withValues(alpha: 0.15),
+            context.appColors.surfaceCard,
+          ]
+        : [
+            const Color(0xFFF59E0B).withValues(alpha: 0.15),  // amber-500 with 15% opacity
+            const Color(0xFF1F2937).withValues(alpha: 0.05),  // gray-800 with 5% opacity
+          ];
+
     return BoxDecoration(
       borderRadius: BorderRadius.circular(AppRadius.xl),
       gradient: LinearGradient(
         begin: Alignment.topCenter,
         end: Alignment.bottomCenter,
-        colors: [
-          goldAccent.withValues(alpha: 0.15),
-          context.appColors.surfaceCard,
-        ],
+        colors: gradientColors,
       ),
       border: Border.all(
-        color: goldAccent.withValues(alpha: 0.3),
+        color: isDark
+            ? context.appColors.accentPrimary.withValues(alpha: 0.3)
+            : const Color(0xFFF59E0B).withValues(alpha: 0.3),
         width: 1,
       ),
     );
@@ -230,7 +241,7 @@ class _WelfareCenterPageState extends State<WelfareCenterPage> {
                     },
               style: ElevatedButton.styleFrom(
                 backgroundColor: goldAccent,
-                foregroundColor: context.colors.onSurface,
+                foregroundColor: context.colors.onPrimary,
                 elevation: 0,
                 shape: RoundedRectangleBorder(
                   borderRadius: BorderRadius.circular(AppRadius.lg),
@@ -239,7 +250,7 @@ class _WelfareCenterPageState extends State<WelfareCenterPage> {
               ),
               child: Text(
                 '复制邀请码',
-                style: AppTextStyles.headlineMedium(context).copyWith(color: context.colors.onSurface),
+                style: AppTextStyles.headlineMedium(context).copyWith(color: context.colors.onPrimary),
               ),
             ),
           ),