feat(admin): Markdown 编辑器分栏实时预览 + 工具栏

- 左写右预览，react-markdown + remark-gfm（表格/GFM 生效）
- 工具栏一键插入标题/加粗/斜体/代码/链接/列表/引用（按光标选区）
- 预览接 prose-site 排版，编辑页返回链接指向 /posts

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

admin/package.json

@@ -10,12 +10,15 @@
     "preview": "vite preview"
   },
   "dependencies": {
+    "@tailwindcss/typography": "^0.5.20",
     "@tailwindcss/vite": "^4.3.3",
     "clsx": "^2.1.1",
     "lucide-react": "^1.24.0",
     "react": "^19.2.7",
     "react-dom": "^19.2.7",
+    "react-markdown": "^10.1.0",
     "react-router-dom": "^7.18.1",
+    "remark-gfm": "^4.0.1",
     "tailwind-merge": "^3.6.0",
     "tailwindcss": "^4.3.3"
   },

admin/src/index.css

@@ -1,4 +1,5 @@
 @import "tailwindcss";
+@plugin "@tailwindcss/typography";
 
 @custom-variant dark (&:is(.dark *));
 
@@ -82,3 +83,32 @@ body {
   height: 0;
   display: none;
 }
+
+/* Markdown 预览排版 — 对齐设计 token */
+.prose-site {
+  --tw-prose-body: var(--ink-2);
+  --tw-prose-headings: var(--ink);
+  --tw-prose-links: var(--accent-ink);
+  --tw-prose-bold: var(--ink);
+  --tw-prose-counters: var(--ink-3);
+  --tw-prose-bullets: var(--hairline-strong);
+  --tw-prose-hr: var(--hairline);
+  --tw-prose-quotes: var(--ink-2);
+  --tw-prose-quote-borders: var(--accent);
+  --tw-prose-code: var(--accent-ink);
+  --tw-prose-pre-bg: var(--term-bg);
+  --tw-prose-pre-code: var(--term-ink);
+  --tw-prose-th-borders: var(--hairline-strong);
+  --tw-prose-td-borders: var(--hairline);
+  --tw-prose-captions: var(--ink-3);
+}
+.prose-site :where(code):not(:where(pre code))::before,
+.prose-site :where(code):not(:where(pre code))::after {
+  content: none;
+}
+.prose-site :where(code):not(:where(pre code)) {
+  background: var(--code-bg);
+  border-radius: 4px;
+  padding: 2px 6px;
+  font-weight: 500;
+}

admin/src/pages/post-edit.tsx

@@ -1,12 +1,18 @@
-import { useEffect, useState, type FormEvent } from 'react'
+import { useEffect, useRef, useState, type FormEvent } from 'react'
 import { Link, useNavigate, useParams } from 'react-router-dom'
-import { ArrowLeft } from 'lucide-react'
+import Markdown from 'react-markdown'
+import remarkGfm from 'remark-gfm'
 import {
-  createPost,
-  fetchPost,
-  updatePost,
-  type PostForm,
-} from '@/api/posts'
+  ArrowLeft,
+  Bold,
+  Code,
+  Heading2,
+  Italic,
+  Link2,
+  List,
+  Quote,
+} from 'lucide-react'
+import { createPost, fetchPost, updatePost, type PostForm } from '@/api/posts'
 
 const EMPTY: PostForm = {
   slug: '',
@@ -26,6 +32,7 @@ export default function PostEditPage() {
   const [loading, setLoading] = useState(isEdit)
   const [saving, setSaving] = useState(false)
   const [error, setError] = useState('')
+  const contentRef = useRef<HTMLTextAreaElement>(null)
 
   useEffect(() => {
     if (!id) return
@@ -56,6 +63,44 @@ export default function PostEditPage() {
   const set = <K extends keyof PostForm>(key: K, value: PostForm[K]) =>
     setForm((f) => ({ ...f, [key]: value }))
 
+  // 在光标选区两侧插入标记（加粗/斜体/代码/链接）
+  const wrap = (before: string, after = before) => {
+    const ta = contentRef.current
+    if (!ta) return
+    const { selectionStart: s, selectionEnd: e, value } = ta
+    const selected = value.slice(s, e)
+    const next = value.slice(0, s) + before + selected + after + value.slice(e)
+    set('content', next)
+    requestAnimationFrame(() => {
+      ta.focus()
+      ta.setSelectionRange(s + before.length, e + before.length)
+    })
+  }
+
+  // 在当前行首插入前缀（标题/列表/引用）
+  const prefix = (pre: string) => {
+    const ta = contentRef.current
+    if (!ta) return
+    const { selectionStart: s, value } = ta
+    const lineStart = value.lastIndexOf('\n', s - 1) + 1
+    const next = value.slice(0, lineStart) + pre + value.slice(lineStart)
+    set('content', next)
+    requestAnimationFrame(() => {
+      ta.focus()
+      ta.setSelectionRange(s + pre.length, s + pre.length)
+    })
+  }
+
+  const tools = [
+    { icon: Heading2, label: '标题', fn: () => prefix('## ') },
+    { icon: Bold, label: '加粗', fn: () => wrap('**') },
+    { icon: Italic, label: '斜体', fn: () => wrap('*') },
+    { icon: Code, label: '行内代码', fn: () => wrap('`') },
+    { icon: Link2, label: '链接', fn: () => wrap('[', '](https://)') },
+    { icon: List, label: '列表', fn: () => prefix('- ') },
+    { icon: Quote, label: '引用', fn: () => prefix('> ') },
+  ]
+
   const onSubmit = async (e: FormEvent) => {
     e.preventDefault()
     setSaving(true)
@@ -66,7 +111,7 @@ export default function PostEditPage() {
       } else {
         await createPost(form)
       }
-      navigate('/')
+      navigate('/posts')
     } catch (err) {
       setError(err instanceof Error ? err.message : '保存失败')
     } finally {
@@ -80,7 +125,7 @@ export default function PostEditPage() {
   return (
     <div>
       <Link
-        to="/"
+        to="/posts"
         className="mb-6 inline-flex items-center gap-1.5 font-mono text-[12.5px] tracking-[0.08em] text-ink-3 transition-colors hover:text-accent-ink"
       >
         <ArrowLeft className="size-3.5" /> 文章列表
@@ -93,7 +138,7 @@ export default function PostEditPage() {
       {loading ? (
         <div className="space-y-4">
           <div className="h-10 animate-pulse rounded-lg bg-code" />
-          <div className="h-64 animate-pulse rounded-lg bg-code" />
+          <div className="h-96 animate-pulse rounded-lg bg-code" />
         </div>
       ) : (
         <form onSubmit={onSubmit} className="space-y-5">
@@ -144,18 +189,48 @@ export default function PostEditPage() {
             </label>
           </div>
 
-          <label className="block">
+          <div>
             <span className="mb-1.5 block text-[13px] text-ink-2">
-              正文（Markdown）
+              正文（Markdown，左侧编辑 · 右侧实时预览）
             </span>
-            <textarea
-              value={form.content}
-              onChange={(e) => set('content', e.target.value)}
-              rows={18}
-              spellCheck={false}
-              className={`${inputCls} resize-y font-mono text-[13.5px] leading-relaxed`}
-            />
-          </label>
+            <div className="overflow-hidden rounded-lg border border-hairline-strong">
+              {/* 工具栏 */}
+              <div className="flex items-center gap-0.5 border-b border-hairline bg-ground px-2 py-1.5">
+                {tools.map((t) => (
+                  <button
+                    key={t.label}
+                    type="button"
+                    title={t.label}
+                    aria-label={t.label}
+                    onClick={t.fn}
+                    className="flex size-8 items-center justify-center rounded-md text-ink-2 transition-colors hover:bg-surface hover:text-accent-ink"
+                  >
+                    <t.icon className="size-[17px]" />
+                  </button>
+                ))}
+              </div>
+              {/* 分栏：左写右预览 */}
+              <div className="grid grid-cols-1 md:grid-cols-2">
+                <textarea
+                  ref={contentRef}
+                  value={form.content}
+                  onChange={(e) => set('content', e.target.value)}
+                  spellCheck={false}
+                  placeholder="# 从这里开始写…"
+                  className="min-h-[440px] resize-y bg-surface p-4 font-mono text-[13.5px] leading-relaxed outline-none placeholder:text-ink-3 md:border-r md:border-hairline"
+                />
+                <div className="prose prose-site min-h-[440px] max-w-none overflow-auto bg-ground p-4 text-[14px]">
+                  {form.content.trim() ? (
+                    <Markdown remarkPlugins={[remarkGfm]}>
+                      {form.content}
+                    </Markdown>
+                  ) : (
+                    <p className="text-ink-3">预览区</p>
+                  )}
+                </div>
+              </div>
+            </div>
+          </div>
 
           <div className="flex items-center justify-between border-t border-hairline pt-5">
             <label className="flex cursor-pointer items-center gap-2.5 text-[14px]">