feat(studio/articles): Dimzou draft preview

Adds a 预览 action (enabled once an article has a Dimzou document) opening a
sheet that fetches and renders the draft — cover, title, summary, and body HTML
(typography/prose). Re-enables the @tailwindcss/typography plugin for prose.

src/routes/_authed/studio/articles.tsx

@@ -4,6 +4,7 @@ import type { ColumnDef } from '@tanstack/react-table'
 import type { StudioArticle } from '@/api/types'
 import { fetchArticles } from '@/api/modules/studio'
 import { useListPage } from '@/lib/list-page'
+import { ArticlePreviewSheet } from '@/features/studio/article-preview-sheet'
 import { DetailSheet } from '@/features/studio/detail-sheet'
 import { DataTable } from '@/components/data-table/data-table'
 import { PageHeader } from '@/components/page-header'
@@ -26,6 +27,7 @@ const STATUSES = ['planned', 'drafting', 'drafted', 'published', 'scheduled'] as
 function ArticlesPage() {
   const [status, setStatus] = useState('all')
   const [detail, setDetail] = useState<StudioArticle | null>(null)
+  const [preview, setPreview] = useState<StudioArticle | null>(null)
   const list = useListPage(
     'studio-articles',
     fetchArticles,
@@ -67,9 +69,19 @@ function ArticlesPage() {
     {
       header: '操作',
       cell: ({ row }) => (
-        <Button size="sm" variant="ghost" onClick={() => setDetail(row.original)}>
-          详情
-        </Button>
+        <div className="flex gap-1.5">
+          <Button
+            size="sm"
+            variant="outline"
+            disabled={!row.original.dimzou_document_id}
+            onClick={() => setPreview(row.original)}
+          >
+            预览
+          </Button>
+          <Button size="sm" variant="ghost" onClick={() => setDetail(row.original)}>
+            详情
+          </Button>
+        </div>
       ),
     },
   ]
@@ -132,6 +144,8 @@ function ArticlesPage() {
           { label: '发布排期', value: detail?.publish_schedule },
         ]}
       />
+
+      <ArticlePreviewSheet article={preview} onOpenChange={(open) => !open && setPreview(null)} />
     </div>
   )
 }