feat(theme): update color scheme with new Slate theme and improved surface hierarchy

Updated the app's color scheme to implement a new "Slate" theme with refined dark and light variants. Changed background colors from #0A0E14 to #0B1120 for dark mode and updated surface layer colors to follow Material Design 3 specifications. Modified text colors and outline variants for better contrast and accessibility. Updated font sizes in transaction details screen from 11px to 12px for improved readability.

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

@@ -18,6 +18,9 @@ import '../../components/glass_panel.dart';
 import '../../components/neon_glow.dart';
 import '../main/main_page.dart';
 import '../mine/welfare_center_page.dart';
+import 'header_bar.dart';
+import 'quick_actions_row.dart';
+import 'hot_coins_section.dart';
 
 /// 首页
 class HomePage extends StatefulWidget {
@@ -102,8 +105,8 @@ class _HomePageState extends State<HomePage>
               child: Column(
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
-                  // 问候
-                  _GreetingSection(),
+                  // Header
+                  HeaderBar(),
                   SizedBox(height: AppSpacing.md),
                   // 资产卡片（含总盈利 + 可折叠盈亏日历）
                   _AssetCard(
@@ -111,6 +114,15 @@ class _HomePageState extends State<HomePage>
                     onDeposit: _showDeposit,
                   ),
                   SizedBox(height: AppSpacing.md),
+                  // 快捷操作栏
+                  QuickActionsRow(
+                    onDeposit: _showDeposit,
+                    onWithdraw: () => _navigateToAssetPage(),
+                    onTransfer: () => _navigateToAssetPage(),
+                    onProfit: () {},
+                    onBills: () => _navigateToAssetPage(),
+                  ),
+                  SizedBox(height: AppSpacing.md),
                   // 福利中心入口卡片
                   _WelfareCard(
                     totalClaimable: _totalClaimable,
@@ -120,6 +132,9 @@ class _HomePageState extends State<HomePage>
                     ),
                   ),
                   SizedBox(height: AppSpacing.lg),
+                  // 热门币种
+                  HotCoinsSection(),
+                  SizedBox(height: AppSpacing.lg),
                   // 持仓
                   _HoldingsSection(holdings: provider.holdings),
                 ],
@@ -416,40 +431,7 @@ class _HomePageState extends State<HomePage>
   }
 }
 
-/// 问候区域
-class _GreetingSection extends StatelessWidget {
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-
-    return Consumer<AuthProvider>(
-      builder: (context, auth, _) {
-        return Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Text(
-              '欢迎回来，',
-              style: TextStyle(
-                color: colorScheme.onSurfaceVariant,
-                fontSize: 14,
-              ),
-            ),
-            SizedBox(height: AppSpacing.xs),
-            Text(
-              auth.user?.username ?? '用户',
-              style: TextStyle(
-                color: colorScheme.onSurface,
-                fontWeight: FontWeight.bold,
-                fontSize: 18,
-              ),
-            ),
-          ],
-        );
-      },
-    );
-  }
-}
-
+/// Header 栏：品牌名 + 搜索/通知/头像
 /// 资产卡片（含总盈利 + 可折叠盈亏日历）
 class _AssetCard extends StatefulWidget {
   final AssetOverview? overview;