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/home_page.dart

@@ -525,6 +525,7 @@ class _AssetCardState extends State<_AssetCard> {
 
     return GlassPanel(
       padding: EdgeInsets.all(20),
+      borderRadius: BorderRadius.circular(AppRadius.lg), // 14px
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
@@ -534,7 +535,7 @@ class _AssetCardState extends State<_AssetCard> {
             children: [
               Text(
                 '预估总资产(USDT)',
-                style: AppTextStyles.bodyMedium(context),
+                style: AppTextStyles.bodyLarge(context), // 13px
               ),
               GestureDetector(
                 onTap: widget.onDeposit,
@@ -570,7 +571,7 @@ class _AssetCardState extends State<_AssetCard> {
           // 总资产金额
           Text(
             displayAsset,
-            style: AppTextStyles.displaySmall(context).copyWith(
+            style: AppTextStyles.displayLarge(context).copyWith(
               fontWeight: FontWeight.bold,
             ),
           ),
@@ -1246,7 +1247,7 @@ class _ProfitStatCard extends StatelessWidget {
                 Text(
                   label,
                   style: AppTextStyles.bodySmall(context).copyWith(
-                    fontWeight: FontWeight.w500,
+                    fontWeight: FontWeight.w400, // w500 → w400
                     color: color.withValues(alpha: 0.8),
                   ),
                 ),
@@ -1258,7 +1259,7 @@ class _ProfitStatCard extends StatelessWidget {
                   ? '${isProfit ? '+' : ''}${value!.toStringAsFixed(2)}'
                   : '--',
               style: AppTextStyles.numberMedium(context).copyWith(
-                fontWeight: FontWeight.bold,
+                fontWeight: FontWeight.w600, // bold → w600
                 color: color,
               ),
             ),

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(