fix(ui): improve spin loading accessibility

docs/components/spin.md

@@ -17,10 +17,17 @@
 }
 `" />
 
+## 可访问性
+
+Spin 在加载中时会渲染为 `role="status"` 的 polite live region。纯视觉旋转图形会从辅助技术中隐藏；当包裹子元素时，外层容器会根据 `spinning` 同步 `aria-busy`。当页面中存在多个加载状态时，建议通过 `tip`、`aria-label` 或 `aria-labelledby` 提供可区分名称。
+
 ## API
 
-| 属性 | 说明 | 类型 | 默认值 |
-| --- | --- | --- | --- |
-| spinning | 是否加载中 | `boolean` | `true` |
-| size | 尺寸 | `'sm' \| 'md' \| 'lg'` | `'md'` |
-| tip | 提示文字 | `ReactNode` | - |
+| 属性            | 说明                     | 类型                               | 默认值                   |
+| --------------- | ------------------------ | ---------------------------------- | ------------------------ |
+| spinning        | 是否加载中               | `boolean`                          | `true`                   |
+| size            | 尺寸                     | `'sm' \| 'md' \| 'lg'`             | `'md'`                   |
+| tip             | 提示文字                 | `ReactNode`                        | -                        |
+| aria-label      | 加载状态可访问名称       | `string`                           | `tip` 文本或 `'Loading'` |
+| aria-labelledby | 使用外部标签命名加载状态 | `string`                           | -                        |
+| aria-live       | 加载状态通知优先级       | `'off' \| 'polite' \| 'assertive'` | `'polite'`               |

packages/ui/src/components/feedback/Spin/Spin.test.tsx

@@ -0,0 +1,48 @@
+import { render, screen } from '@testing-library/react'
+import { describe, expect, it } from 'vitest'
+
+import { Spin } from './Spin'
+
+describe('Spin', () => {
+  it('announces standalone loading state as a polite status', () => {
+    render(<Spin />)
+
+    const status = screen.getByRole('status', { name: 'Loading' })
+
+    expect(status).toHaveAttribute('aria-live', 'polite')
+    expect(status.querySelector('[aria-hidden="true"]')).toBeInTheDocument()
+  })
+
+  it('uses string tip as the accessible loading name', () => {
+    render(<Spin tip="Loading invoices" />)
+
+    expect(screen.getByRole('status', { name: 'Loading invoices' })).toBeInTheDocument()
+    expect(screen.getByText('Loading invoices')).toBeInTheDocument()
+  })
+
+  it('marks wrapped content busy while the overlay is spinning', () => {
+    render(
+      <Spin spinning tip="Refreshing data">
+        <section aria-label="Report panel">Report content</section>
+      </Spin>,
+    )
+
+    const wrapper = screen.getByText('Report content').parentElement
+
+    expect(wrapper).toHaveAttribute('aria-busy', 'true')
+    expect(screen.getByRole('status', { name: 'Refreshing data' })).toBeInTheDocument()
+  })
+
+  it('marks wrapped content not busy and hides status when spinning stops', () => {
+    render(
+      <Spin spinning={false}>
+        <section>Loaded content</section>
+      </Spin>,
+    )
+
+    const wrapper = screen.getByText('Loaded content').parentElement
+
+    expect(wrapper).toHaveAttribute('aria-busy', 'false')
+    expect(screen.queryByRole('status')).not.toBeInTheDocument()
+  })
+})

packages/ui/src/components/feedback/Spin/Spin.tsx

@@ -8,32 +8,59 @@ export interface SpinProps extends HTMLAttributes<HTMLDivElement> {
 }
 
 export const Spin = forwardRef<HTMLDivElement, SpinProps>(function Spin(
-  { className, spinning = true, size = 'md', tip, children, ...props },
+  {
+    className,
+    spinning = true,
+    size = 'md',
+    tip,
+    children,
+    'aria-label': ariaLabel,
+    'aria-labelledby': ariaLabelledBy,
+    'aria-live': ariaLive,
+    ...props
+  },
   ref,
 ) {
+  const accessibleLabel =
+    ariaLabel ?? (ariaLabelledBy ? undefined : typeof tip === 'string' ? tip : 'Loading')
+
   const spinner = (
-    <div className="flex flex-col items-center gap-2">
+    <div
+      className="flex flex-col items-center gap-2"
+      role="status"
+      aria-label={accessibleLabel}
+      aria-labelledby={ariaLabelledBy}
+      aria-live={ariaLive ?? 'polite'}
+    >
       <span
-        className={cn('inline-block animate-spin rounded-full border-2 border-brand-500 border-r-transparent', {
-          'h-4 w-4': size === 'sm',
-          'h-6 w-6': size === 'md',
-          'h-8 w-8': size === 'lg',
-        })}
+        aria-hidden="true"
+        className={cn(
+          'inline-block animate-spin rounded-full border-2 border-brand-500 border-r-transparent',
+          {
+            'h-4 w-4': size === 'sm',
+            'h-6 w-6': size === 'md',
+            'h-8 w-8': size === 'lg',
+          },
+        )}
       />
       {tip ? <span className="text-sm text-slate-500 dark:text-slate-400">{tip}</span> : null}
     </div>
   )
 
   if (!children) {
     return spinning ? (
-      <div ref={ref} className={cn('inline-flex items-center justify-center', className)} {...props}>
+      <div
+        ref={ref}
+        className={cn('inline-flex items-center justify-center', className)}
+        {...props}
+      >
         {spinner}
       </div>
     ) : null
   }
 
   return (
-    <div ref={ref} className={cn('relative', className)} {...props}>
+    <div ref={ref} className={cn('relative', className)} {...props} aria-busy={spinning}>
       {children}
       {spinning ? (
         <div className="absolute inset-0 flex items-center justify-center rounded bg-white/60 dark:bg-slate-900/60">