fix(web): 恢复与旧版一致的布局与组件参数

- 布局：Layout 使用 contained(1380)+gutter20+siderWidth240+gap20、solid 60px 页头、整屏内部滚动
- 搜索框恢复悬浮居中；侧栏与内容恢复 52/88px 顶部偏移
- 新增并使用 @stash/ui 的 Cover（海报 2:3 / 图文 4:3 / 宽图）替换手写封面
- 头像恢复 64px 品牌底色；正文恢复 14/1.9；详情标题、标签、引用、统计、跳转按原版还原
- 分区卡 padding 20、分区标题 16、网格间距 12/16 对齐原值

stash-web/src/components/content/ArticleDetailView.tsx

@@ -1,4 +1,4 @@
-import { Button, Card, Paragraph, Space, Text, Title } from '@stash/ui'
+import { Card, Paragraph, Space, Text, Title } from '@stash/ui'
 import type { ArticleItem } from '../../data/types'
 import { ArticleBody } from './ArticleBody'
 
@@ -20,23 +20,23 @@ export function ArticleDetailView({ article, categoryTitle, onBack }: ArticleDet
 
   return (
     <div className="detail-view article-view">
-      <Card padding="sm">
+      <Card padding="none" className="detail-nav">
         <Space justify="between" wrap>
-          <Button variant="ghost" size="sm" onClick={onBack}>
+          <button type="button" className="detail-back" onClick={onBack}>
             返回
-          </Button>
-          <Text size="sm" tone="sub">
+          </button>
+          <Text size="xs" tone="muted">
             {categoryTitle} / 文章
           </Text>
         </Space>
       </Card>
 
       <header className="article-head">
-        <Title level={2}>
+        <Title level={1} as="h2" className="article-heading">
           {article.title}
-          <Button variant="ghost" size="sm" disabled className="item-edit">
-            编辑
-          </Button>
+          <button type="button" className="item-edit" disabled title="编辑功能待接入">
+            [编辑]
+          </button>
         </Title>
 
         <Space gap="sm" wrap>
@@ -55,9 +55,9 @@ export function ArticleDetailView({ article, categoryTitle, onBack }: ArticleDet
         </Space>
       </header>
 
-      <Card padding="lg">
+      <Card padding="none" className="article-body-card">
         <div className="article-body">
-          <Paragraph tone="main" className="article-lead">
+          <Paragraph tone="main" size="md" leading="relaxed" className="article-lead">
             {article.desc}
           </Paragraph>
           <ArticleBody markdown={article.body} />