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/sidebar/CategoryNav.tsx

@@ -65,7 +65,7 @@ export function CategoryNav({
   }
 
   return (
-    <Card padding="sm" className="nav-card">
+    <Card padding="none" className="nav-card">
       <Menu items={items} activeKey={activeKey} onSelect={handleSelect} />
     </Card>
   )

stash-web/src/components/sidebar/ProfileCard.tsx

@@ -10,8 +10,8 @@ export function ProfileCard() {
 
   return (
     <Card padding="lg" className="profile-card">
-      <Avatar size="lg" fallback="S" verified />
-      <Title level={4}>{name}</Title>
+      <Avatar size="xl" tone="primary" fallback="S" verified />
+      <Title level={3}>{name}</Title>
       {!name.includes(role) && <Tag shape="rounded">{role}</Tag>}
       <Paragraph>{bio}</Paragraph>
       <Text size="xs" tone="muted">

stash-web/src/components/sidebar/ServicePanel.tsx

@@ -16,7 +16,7 @@ export function ServicePanel({ projects, live, refreshing, onRefresh }: ServiceP
   const host = typeof window === 'undefined' ? '-' : window.location.host
 
   return (
-    <Card padding="md" className="service-panel">
+    <Card padding="none" className="service-panel">
       <Space justify="between">
         <Title level={4} as="h2">
           本地服务
@@ -48,7 +48,7 @@ export function ServicePanel({ projects, live, refreshing, onRefresh }: ServiceP
       <Space gap="sm" wrap>
         <Button
           size="sm"
-          variant="ghost"
+          variant="secondary"
           loading={refreshing}
           icon={<Icon name="refresh_3_line" />}
           onClick={onRefresh}