fix(web): 计数角标改回悬挂在标题右上角，搜索框圆角恢复 12px

- 角标：绝对定位 top -8 / right -18、16 高、8 圆角、12/700、危险色阴影（原来跟在标题后面占行内空间）
- 标题前色条补 8px 右间距，标题起点与旧版一致
- 搜索框：圆角 6 → 12（旧版 card-box 的圆角）

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

@@ -1,4 +1,4 @@
-import { Badge, Card, Icon, IconButton, Space, Title } from '@stash/ui'
+import { Badge, Card, Icon, IconButton, Title } from '@stash/ui'
 import type { ReactNode } from 'react'
 
 /**
@@ -19,13 +19,15 @@ export function SectionCard({ title, count, barColor, onMore, children }: Sectio
   return (
     <Card padding="md" className="section-card">
       <div className="section-header">
-        <Space gap="sm">
+        <span className="section-title-wrapper">
           <span className="section-bar" style={{ backgroundColor: barColor }} aria-hidden="true" />
-          <Title level={3} as="h2" weight="semibold">
-            {title}
-          </Title>
-          <Badge count={count} tone="danger" />
-        </Space>
+          <span className="section-title-box">
+            <Title level={3} as="h2" weight="semibold">
+              {title}
+            </Title>
+            <Badge count={count} tone="danger" className="count-badge" />
+          </span>
+        </span>
 
         {onMore !== undefined && (
           <IconButton