feat: 添加退出登录按钮(桌面Header + 移动端"我"页面)

- Header: 桌面端右上角退出图标,带确认弹窗
- Me页面: 底部退出登录按钮,带确认弹窗

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

web2/src/components/layout/Header.tsx

@@ -1,20 +1,33 @@
 /** 顶部 Header(h-14 sticky)
- * 桌面:显示当前页面标题 + 用户信息
+ * 桌面:显示当前页面标题 + 用户信息 + 退出按钮
  * 移动:显示 Logo + 通知铃铛
  */
-import { useLocation } from 'react-router-dom'
-import { Bell } from 'lucide-react'
+import { useState } from 'react'
+import { useLocation, useNavigate } from 'react-router-dom'
+import { Bell, LogOut } from 'lucide-react'
 import { HEADER_TITLES } from '@/lib/nav-config'
-import { getName } from '@/lib/auth'
+import { getName, clearAuth } from '@/lib/auth'
+import {
+  Dialog, DialogContent, DialogHeader, DialogTitle, DialogDescription, DialogFooter,
+} from '@/components/ui/dialog'
+import { Button } from '@/components/ui/button'
 
 export function Header() {
   const { pathname } = useLocation()
+  const navigate = useNavigate()
   const name = getName()
+  const [confirmLogout, setConfirmLogout] = useState(false)
+
   // 匹配标题(支持子路由,取最长匹配)
   const title = Object.entries(HEADER_TITLES)
     .filter(([p]) => pathname === p || (p !== '/' && pathname.startsWith(p)))
     .sort((a, b) => b[0].length - a[0].length)[0]?.[1] || '左右 BossAi'
 
+  const handleLogout = () => {
+    clearAuth()
+    navigate('/login')
+  }
+
   return (
     <header className="sticky top-0 z-20 flex h-14 items-center gap-3 border-b border-border bg-white/95 px-4 backdrop-blur md:px-6">
       {/* 移动端 Logo */}
@@ -36,6 +49,28 @@ export function Header() {
       {name && (
         <span className="hidden text-sm text-muted-foreground md:inline">{name}</span>
       )}
+      {/* 退出按钮(桌面) */}
+      <button
+        onClick={() => setConfirmLogout(true)}
+        className="hidden h-9 w-9 items-center justify-center rounded-lg text-muted-foreground transition-colors hover:bg-red-50 hover:text-red-600 md:flex"
+        aria-label="退出登录"
+      >
+        <LogOut className="h-5 w-5" />
+      </button>
+
+      {/* 退出确认弹窗 */}
+      <Dialog open={confirmLogout} onOpenChange={setConfirmLogout}>
+        <DialogContent className="max-w-sm">
+          <DialogHeader>
+            <DialogTitle>退出登录</DialogTitle>
+            <DialogDescription>确定要退出当前账号吗?</DialogDescription>
+          </DialogHeader>
+          <DialogFooter>
+            <Button variant="outline" onClick={() => setConfirmLogout(false)}>取消</Button>
+            <Button variant="destructive" onClick={handleLogout}>退出</Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
     </header>
   )
 }