feat: 后台页头加明暗切换；内容卡改用库里的 EntryRow / EntryTile

- 后台页头新增月亮/太阳按钮：写回 site.theme 并即时切换，前后台一起变，
  忽略未登录与保存中
- AppCard -> EntryRow，CesCard -> EntryTile（PosterCard 本来就用 Cover）
- 删除 .app-card / .app-card-* / .ces-card / .ces-body* 手写样式，
  两套卡片的点击语义与悬停反馈统一由库提供

视觉变化：头像认证勾回到库默认尺寸（20px，之前应用里压到 10px）

stash-web/src/components/admin/AdminNext.tsx

@@ -178,6 +178,28 @@ export function AdminNext() {
     toast.success('侧边栏已保存')
   }
 
+  /** 页头的明暗切换：写回 site.theme，前后台一起变 */
+  const themeSetting = draft?.site.theme ?? document?.settings.site.theme ?? 'auto'
+  const prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches
+  const isDark = themeSetting === 'dark' || (themeSetting === 'auto' && prefersDark)
+
+  const toggleTheme = async () => {
+    if (document === null || draft === null) return
+    const next = isDark ? 'light' : 'dark'
+    setSaving(true)
+    const result = await saveSettings(document.version, {
+      ...draft,
+      site: { ...draft.site, theme: next },
+    })
+    setSaving(false)
+    if (!result.ok) {
+      toast.error(result.error)
+      return
+    }
+    setDocument(result.document)
+    setDraft(clone(result.document.settings))
+  }
+
   const confirmDelete = async () => {
     if (pending === null) return
     setDeleting(true)
@@ -209,6 +231,12 @@ export function AdminNext() {
           <Brand href="/" name={brandName} mark={brandMark} logo={brandLogo} />
 
           <div className="header-actions">
+            <IconButton
+              label={isDark ? '切换到浅色' : '切换到深色'}
+              icon={<Icon name={isDark ? 'sun_line' : 'moon_line'} />}
+              onClick={() => void toggleTheme()}
+              disabled={!authenticated || saving}
+            />
             <IconButton
               label="返回首页"
               icon={<Icon name="arrow_left_line" />}

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

@@ -1,9 +1,9 @@
-import { Avatar, ItemBadge, Space, Text } from '@stash/ui'
+import { EntryRow, ItemBadge } from '@stash/ui'
 import type { AppItem } from '../../data/types'
 
 /**
  * 应用卡片：头像 + 名称（热门带 HOT 角标）+ 单行描述。
- * 点击进入条目详情；按住修饰键时保持浏览器默认行为（新标签打开原始链接）。
+ * 版式与点击语义都在库里的 EntryRow，这里只做数据映射。
  */
 type AppCardProps = {
   item: AppItem
@@ -12,37 +12,15 @@ type AppCardProps = {
 
 export function AppCard({ item, onOpen }: AppCardProps) {
   return (
-    <a
-      className="app-card"
-      href={item.href}
+    <EntryRow
       title={item.name}
-      onClick={(event) => {
-        if (onOpen === undefined) return
-        if (event.metaKey || event.ctrlKey || event.shiftKey || event.altKey) return
-        event.preventDefault()
-        onOpen(item.id)
-      }}
-    >
-      <Avatar
-        size="lg"
-        tone="primary"
-        className="app-card-avatar"
-        src={item.cover}
-        fallback={item.icon}
-        verified={item.hot === true}
-      />
-
-      <div className="app-card-info">
-        <Space gap="xs">
-          <Text strong truncate className="app-card-name">
-            {item.name}
-          </Text>
-          {item.hot === true && <ItemBadge tone="hot">HOT</ItemBadge>}
-        </Space>
-        <Text size="xs" tone="muted" truncate>
-          {item.desc}
-        </Text>
-      </div>
-    </a>
+      description={item.desc}
+      href={item.href}
+      avatar={item.cover}
+      fallback={item.icon}
+      verified={item.hot === true}
+      badge={item.hot === true ? <ItemBadge tone="hot">HOT</ItemBadge> : undefined}
+      onOpen={onOpen === undefined ? undefined : () => onOpen(item.id)}
+    />
   )
 }

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

@@ -1,9 +1,9 @@
-import { Card, Cover, Space, Text } from '@stash/ui'
+import { EntryTile } from '@stash/ui'
 import type { ArticleItem } from '../../data/types'
 
 /**
  * 明细页图文卡：上图下文的白卡。
- * 传入 onOpen 时整张卡变成按钮，点击进入文章详情。
+ * 版式与点击语义都在库里的 EntryTile，这里只做数据映射。
  */
 type CesCardProps = {
   item: ArticleItem
@@ -11,38 +11,12 @@ type CesCardProps = {
 }
 
 export function CesCard({ item, onOpen }: CesCardProps) {
-  const body = (
-    <Space direction="column" gap="xs" align="stretch">
-      <Text strong truncate>
-        {item.title}
-      </Text>
-      <Text size="xs" tone="muted" truncate>
-        {item.desc}
-      </Text>
-    </Space>
-  )
-
   return (
-    <Card padding="none" hoverable className="ces-card">
-      <Cover
-        src={item.cover}
-        alt={item.title}
-        ratio={16 / 10}
-        radius="none"
-        onClick={onOpen === undefined ? undefined : () => onOpen(item.id)}
-      />
-      {onOpen === undefined ? (
-        <div className="ces-body">{body}</div>
-      ) : (
-        <button
-          type="button"
-          className="ces-body ces-body--button"
-          title={item.title}
-          onClick={() => onOpen(item.id)}
-        >
-          {body}
-        </button>
-      )}
-    </Card>
+    <EntryTile
+      title={item.title}
+      description={item.desc}
+      cover={item.cover}
+      onOpen={onOpen === undefined ? undefined : () => onOpen(item.id)}
+    />
   )
 }