fix(ui): 对齐所有页面样式到 Pencil 设计规范

transfer_page.dart:
- 金色主题统一（Light: secondary #F59E0B, Dark: primary #D4AF37）
- 修复交换按钮和确认按钮颜色

home_page.dart:
- Asset Card 圆角 14px
- 总资产字号 28px (displayLarge)
- "预估总资产"字号 13px (bodyLarge)
- 盈亏标签/数值字重调整

quick_actions_row.dart:
- padding 统一为 16px

welfare_center_page.dart:
- _statusBadge padding [6, 14]

trade_form_card.dart / price_card.dart:
- 样式细节对齐

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

@@ -34,7 +34,7 @@ class QuickActionsRow extends StatelessWidget {
         : const Color(0xFFE2E8F0);
 
     return Container(
-      padding: const EdgeInsets.symmetric(vertical: AppSpacing.md, horizontal: AppSpacing.sm),
+      padding: const EdgeInsets.all(16),
       decoration: BoxDecoration(
         color: containerBg,
         border: Border.all(