fix: 修复当天入职员工被误判为预入职的时区问题；数据导出独立为设置Tab

frontend/src/pages/Settings.tsx

@@ -11,7 +11,7 @@ import Modal from '../components/ui/Modal'
 
 export default function Settings() {
   const queryClient = useQueryClient()
-  const [activeSection, setActiveSection] = useState<'org' | 'users' | 'plan' | 'notifications' | 'import'>('org')
+  const [activeSection, setActiveSection] = useState<'org' | 'users' | 'plan' | 'notifications' | 'import' | 'export'>('org')
 
   const { data: orgData } = useQuery<any>({
     queryKey: ['org-settings'],
@@ -40,6 +40,7 @@ export default function Settings() {
     { key: 'plan' as const, label: '套餐', icon: CreditCard },
     { key: 'notifications' as const, label: '通知设置', icon: Bell },
     { key: 'import' as const, label: '数据导入', icon: FileSpreadsheet },
+    { key: 'export' as const, label: '数据导出', icon: Download },
   ]
 
   return (
@@ -77,6 +78,12 @@ export default function Settings() {
       {activeSection === 'plan' && <PlanSettings orgData={orgData} />}
       {activeSection === 'notifications' && <NotificationSettings />}
       {activeSection === 'import' && <ImportSettings />}
+      {activeSection === 'export' && (
+        <Card>
+          <h2 className="font-medium mb-4">数据导出</h2>
+          <ExportSettings />
+        </Card>
+      )}
     </div>
   )
 }
@@ -131,10 +138,6 @@ function OrgSettings({ orgData, onSave, saving }: { orgData: any; onSave: (data:
         </Button>
       </div>
 
-      <div className="mt-6 pt-4 border-t">
-        <h3 className="text-xs font-medium text-gray-600 mb-3">数据导出</h3>
-        <ExportSettings />
-      </div>
     </Card>
   )
 }