feat(admin): 交互打磨 — toast 提示 + 删除确认对话框

- 全局 toast：保存/删除成功失败即时反馈，替代静默保存
- 删除确认对话框替换 window.confirm，危险操作红色按钮
- 编辑保存成功 toast + 跳转列表

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

admin/src/components/confirm-dialog.tsx

@@ -0,0 +1,63 @@
+import { cn } from '@/lib/utils'
+
+interface Props {
+  open: boolean
+  title: string
+  description?: string
+  confirmText?: string
+  danger?: boolean
+  loading?: boolean
+  onConfirm: () => void
+  onCancel: () => void
+}
+
+export function ConfirmDialog({
+  open,
+  title,
+  description,
+  confirmText = '确认',
+  danger,
+  loading,
+  onConfirm,
+  onCancel,
+}: Props) {
+  if (!open) return null
+  return (
+    <div
+      className="fixed inset-0 z-[90] flex items-center justify-center bg-black/40 p-4"
+      onClick={onCancel}
+    >
+      <div
+        className="w-full max-w-sm rounded-xl border border-hairline bg-surface p-6"
+        onClick={(e) => e.stopPropagation()}
+      >
+        <h3 className="text-[16px] font-semibold">{title}</h3>
+        {description && (
+          <p className="mt-2 text-[13.5px] leading-relaxed text-ink-2">
+            {description}
+          </p>
+        )}
+        <div className="mt-5 flex justify-end gap-2.5">
+          <button
+            type="button"
+            onClick={onCancel}
+            className="rounded-lg border border-hairline-strong px-4 py-2 text-[13.5px] text-ink-2 transition-colors hover:bg-ground"
+          >
+            取消
+          </button>
+          <button
+            type="button"
+            onClick={onConfirm}
+            disabled={loading}
+            className={cn(
+              'rounded-lg px-4 py-2 text-[13.5px] font-medium text-ground transition-opacity hover:opacity-90 disabled:opacity-60',
+              danger ? 'bg-red-600' : 'bg-accent',
+            )}
+          >
+            {loading ? '处理中…' : confirmText}
+          </button>
+        </div>
+      </div>
+    </div>
+  )
+}

admin/src/components/toast.tsx

@@ -0,0 +1,61 @@
+import {
+  createContext,
+  useCallback,
+  useContext,
+  useState,
+  type ReactNode,
+} from 'react'
+import { CheckCircle2, XCircle } from 'lucide-react'
+import { cn } from '@/lib/utils'
+
+type ToastType = 'success' | 'error'
+interface ToastItem {
+  id: number
+  message: string
+  type: ToastType
+}
+
+const ToastCtx = createContext<(message: string, type?: ToastType) => void>(
+  () => {},
+)
+
+let seq = 0
+
+export function ToastProvider({ children }: { children: ReactNode }) {
+  const [items, setItems] = useState<ToastItem[]>([])
+
+  const toast = useCallback((message: string, type: ToastType = 'success') => {
+    const id = ++seq
+    setItems((l) => [...l, { id, message, type }])
+    setTimeout(() => setItems((l) => l.filter((t) => t.id !== id)), 3000)
+  }, [])
+
+  return (
+    <ToastCtx.Provider value={toast}>
+      {children}
+      <div className="fixed right-4 top-4 z-[100] flex flex-col gap-2">
+        {items.map((t) => (
+          <div
+            key={t.id}
+            role="status"
+            className={cn(
+              'flex items-center gap-2.5 rounded-lg border bg-surface px-4 py-2.5 text-[13.5px] shadow-md',
+              t.type === 'success' ? 'border-hairline' : 'border-red-500/40',
+            )}
+          >
+            {t.type === 'success' ? (
+              <CheckCircle2 className="size-[17px] text-accent" />
+            ) : (
+              <XCircle className="size-[17px] text-red-500" />
+            )}
+            <span className="text-ink">{t.message}</span>
+          </div>
+        ))}
+      </div>
+    </ToastCtx.Provider>
+  )
+}
+
+export function useToast() {
+  return useContext(ToastCtx)
+}

admin/src/main.tsx

@@ -2,15 +2,18 @@ import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
 import { BrowserRouter } from 'react-router-dom'
 import { ThemeProvider } from '@/components/theme-provider'
+import { ToastProvider } from '@/components/toast'
 import App from '@/App'
 import '@/index.css'
 
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
     <ThemeProvider>
-      <BrowserRouter basename="/admin">
-        <App />
-      </BrowserRouter>
+      <ToastProvider>
+        <BrowserRouter basename="/admin">
+          <App />
+        </BrowserRouter>
+      </ToastProvider>
     </ThemeProvider>
   </StrictMode>,
 )

admin/src/pages/post-edit.tsx

@@ -13,6 +13,7 @@ import {
   Quote,
 } from 'lucide-react'
 import { createPost, fetchPost, updatePost, type PostForm } from '@/api/posts'
+import { useToast } from '@/components/toast'
 
 const EMPTY: PostForm = {
   slug: '',
@@ -26,6 +27,7 @@ const EMPTY: PostForm = {
 export default function PostEditPage() {
   const { id } = useParams()
   const navigate = useNavigate()
+  const toast = useToast()
   const isEdit = Boolean(id)
 
   const [form, setForm] = useState<PostForm>(EMPTY)
@@ -104,16 +106,16 @@ export default function PostEditPage() {
   const onSubmit = async (e: FormEvent) => {
     e.preventDefault()
     setSaving(true)
-    setError('')
     try {
       if (isEdit && id) {
         await updatePost(id, form)
       } else {
         await createPost(form)
       }
+      toast('已保存')
       navigate('/posts')
     } catch (err) {
-      setError(err instanceof Error ? err.message : '保存失败')
+      toast(err instanceof Error ? err.message : '保存失败', 'error')
     } finally {
       setSaving(false)
     }

admin/src/pages/posts-list.tsx

@@ -7,15 +7,20 @@ import {
   type PageResult,
   type PostListItem,
 } from '@/api/posts'
+import { useToast } from '@/components/toast'
+import { ConfirmDialog } from '@/components/confirm-dialog'
 
 const PAGE_SIZE = 10
 
 export default function PostsListPage() {
+  const toast = useToast()
   const [page, setPage] = useState(1)
   const [keyword, setKeyword] = useState('')
   const [input, setInput] = useState('')
   const [result, setResult] = useState<PageResult<PostListItem> | null>(null)
   const [error, setError] = useState('')
+  const [target, setTarget] = useState<PostListItem | null>(null)
+  const [deleting, setDeleting] = useState(false)
 
   const load = useCallback(() => {
     fetchPosts(page, PAGE_SIZE, keyword)
@@ -30,13 +35,18 @@ export default function PostsListPage() {
     load()
   }, [load])
 
-  const onDelete = async (post: PostListItem) => {
-    if (!window.confirm(`确认删除「${post.title}」？此操作不可恢复。`)) return
+  const confirmDelete = async () => {
+    if (!target) return
+    setDeleting(true)
     try {
-      await deletePost(post.id)
+      await deletePost(target.id)
+      toast('已删除')
+      setTarget(null)
       load()
     } catch (err) {
-      setError(err instanceof Error ? err.message : '删除失败')
+      toast(err instanceof Error ? err.message : '删除失败', 'error')
+    } finally {
+      setDeleting(false)
     }
   }
 
@@ -130,7 +140,7 @@ export default function PostsListPage() {
                   <button
                     type="button"
                     aria-label={`删除 ${post.title}`}
-                    onClick={() => onDelete(post)}
+                    onClick={() => setTarget(post)}
                     className="rounded p-1.5 text-ink-3 transition-colors hover:text-red-600 dark:hover:text-red-400"
                   >
                     <Trash2 className="size-4" />
@@ -174,6 +184,19 @@ export default function PostsListPage() {
           </button>
         </div>
       )}
+
+      <ConfirmDialog
+        open={!!target}
+        title="删除文章"
+        description={
+          target ? `确认删除「${target.title}」？此操作不可恢复。` : ''
+        }
+        confirmText="删除"
+        danger
+        loading={deleting}
+        onConfirm={confirmDelete}
+        onCancel={() => setTarget(null)}
+      />
     </div>
   )
 }