fix(ui): [UI7-2] 统一全局 Design Tokens，移除冗余字体，修复异常色值引用

client/src/pages/LoginPage.tsx

@@ -62,9 +62,9 @@ export function LoginPage() {
     <Card className="space-y-6 border-primary-100 p-6">
       <div className="mb-6">
         <p className="text-xs font-semibold uppercase tracking-wide text-primary">hyb-oa</p>
-        <h1 className="mt-2 text-2xl font-bold text-slate-900">登录工作台</h1>
+        <h1 className="mt-2 text-2xl font-bold text-zinc-900">登录工作台</h1>
         <p className="mt-2 text-sm text-secondary">使用邮箱/手机号与密码登录。</p>
-        <p className="mt-1 text-xs text-slate-500">忘记密码：请联系管理员重置。</p>
+        <p className="mt-1 text-xs text-zinc-500">忘记密码：请联系管理员重置。</p>
       </div>
 
       <form className="space-y-4" onSubmit={handleSubmit}>