feat: 员工门户UI优化 - PortalLayout/Logo组件/QR扫码登录/合同与政策页面重构

frontend/src/components/ui/Button.tsx

@@ -15,7 +15,7 @@ export default function Button({ variant = 'primary', size = 'md', className, ch
           'bg-primary text-white hover:bg-primary-dark': variant === 'primary',
           'bg-gray-100 text-gray-700 hover:bg-gray-200': variant === 'secondary',
           'bg-danger text-white hover:bg-red-700': variant === 'danger',
-          'px-2.5 py-1 text-xs': size === 'sm',
+          'px-3 py-1.5 text-xs': size === 'sm',
           'px-4 py-2 text-sm': size === 'md',
           'px-5 py-2.5 text-base': size === 'lg',
         },

frontend/src/components/ui/Logo.tsx

@@ -0,0 +1,19 @@
+/**
+ * 应用 Logo 图标 — 与 favicon.svg 保持一致
+ */
+
+interface LogoProps {
+  className?: string
+}
+
+export default function Logo({ className = 'w-5 h-5' }: LogoProps) {
+  return (
+    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32" className={className} fill="none">
+      <rect width="32" height="32" rx="6" fill="currentColor" />
+      <path d="M16 6 L24 10 L24 16 L16 20 L8 16 L8 10 Z" stroke="white" strokeWidth="1.5" strokeLinejoin="round" />
+      <circle cx="16" cy="13" r="2" fill="white" />
+      <path d="M12 24 L12 20 M20 24 L20 20 M16 22 L16 20" stroke="white" strokeWidth="1.5" strokeLinecap="round" />
+      <rect x="10" y="24" width="12" height="2" rx="1" fill="white" />
+    </svg>
+  )
+}