fix(ui): 对齐首页样式到 Pencil 设计规范

- Asset Card: padding 20px (was 24px)
- 充值按钮: cornerRadius 6px, padding [5,10], icon 13px, text 12px
- Quick Actions: 边框颜色 Light #E2E8F0, Dark #1E293B
- Quick Action Icons: 背景色 Light #F3F4F6, Dark #1E293B
- Quick Action Icons: 图标色 Light #4B5563
- cornerRadius: -lg (14px) for cards

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

@@ -524,7 +524,7 @@ class _AssetCardState extends State<_AssetCard> {
     final displayAsset = _formatAsset(totalAsset);
 
     return GlassPanel(
-      padding: EdgeInsets.all(AppSpacing.lg),
+      padding: EdgeInsets.all(20),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
@@ -540,22 +540,23 @@ class _AssetCardState extends State<_AssetCard> {
                 onTap: widget.onDeposit,
                 child: Container(
                   padding: EdgeInsets.symmetric(
-                    horizontal: AppSpacing.md,
-                    vertical: AppSpacing.xs + 2,
+                    horizontal: 10,
+                    vertical: 5,
                   ),
                   decoration: BoxDecoration(
                     color: context.colors.primary,
-                    borderRadius: BorderRadius.circular(AppRadius.full),
+                    borderRadius: BorderRadius.circular(AppRadius.sm),
                   ),
                   child: Row(
                     mainAxisSize: MainAxisSize.min,
                     children: [
-                      Icon(Icons.add, size: 14, color: context.colors.onPrimary),
-                      SizedBox(width: AppSpacing.xs),
+                      Icon(Icons.add, size: 13, color: context.colors.onPrimary),
+                      SizedBox(width: 4),
                       Text(
                         '充值',
                         style: AppTextStyles.labelLarge(context).copyWith(
                           color: context.colors.onPrimary,
+                          fontSize: 12,
                         ),
                       ),
                     ],