优化错题本页面UI和标题样式

主要改动：
1. 统一标题样式，与答题页面保持一致
   - 标题居中显示
   - 返回按钮使用绝对定位在左侧
   - 移除标题中的图标
   - Title组件level改为3
   - 响应式字体大小：移动端16px，PC端20px，超宽屏22px

2. 优化首页统计文案
   - 将"已刷"改为"已刷题目"，更加清晰明确

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

web/src/pages/Home.tsx

@@ -415,7 +415,7 @@ const Home: React.FC = () => {
               <div className={styles.statDivider}></div>
               <div className={styles.statItem}>
                 <div className={styles.statValue}>{statistics.answered_questions}</div>
-                <div className={styles.statLabel}>已刷</div>
+                <div className={styles.statLabel}>已刷题目</div>
               </div>
               <div className={styles.statDivider}></div>
               <div className={styles.statItem}>

web/src/pages/WrongQuestions.module.less

@@ -8,25 +8,33 @@
   padding: 20px;
   padding-bottom: 16px;
   background: transparent;
-}
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  position: relative;
 
-.backButton {
+  .backButton {
     color: #007aff;
-  margin-bottom: 12px;
+    font-weight: 500;
+    padding: 4px 12px;
     transition: all 0.3s ease;
+    position: absolute;
+    left: 20px;
 
     &:hover {
       color: #0051d5;
       transform: translateX(-4px);
     }
-}
+  }
 
-.title {
+  .title {
     color: #1d1d1f !important;
     margin: 0 !important;
-  font-size: 28px;
     font-weight: 700;
+    font-size: 18px !important;
+    text-align: center;
     text-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
+  }
 }
 
 // 统计卡片容器
@@ -310,10 +318,16 @@
 
   .header {
     padding: 16px;
+
+    .backButton {
+      font-size: 14px;
+      padding: 4px 8px;
+      left: 16px;
     }
 
     .title {
-    font-size: 24px;
+      font-size: 16px !important;
+    }
   }
 
   .statsContainer {
@@ -441,10 +455,10 @@
 
   .header {
     padding: 32px 32px 24px;
-  }
 
     .title {
-    font-size: 32px;
+      font-size: 20px !important;
+    }
   }
 
   .statsContainer {
@@ -508,4 +522,10 @@
   .container {
     max-width: 1600px;
   }
+
+  .header {
+    .title {
+      font-size: 22px !important;
+    }
+  }
 }

web/src/pages/WrongQuestions.tsx

@@ -2,7 +2,6 @@ import React, { useEffect, useState } from 'react'
 import { useNavigate } from 'react-router-dom'
 import { Card, List, Button, Tag, Typography, Space, message, Modal, Empty, Statistic, Progress, Select, Row, Col } from 'antd'
 import {
-  BookOutlined,
   CloseCircleOutlined,
   ArrowLeftOutlined,
   PlayCircleOutlined,
@@ -169,8 +168,8 @@ const WrongQuestions: React.FC = () => {
         >
           返回
         </Button>
-        <Title level={2} className={styles.title}>
+        <Title level={3} className={styles.title}>
-          <BookOutlined /> 错题本
+          错题本
         </Title>
       </div>