refactor(ui): [UI8] 彻底移除遗留Card并补充下拉框中文化

client/src/pages/LoginPage.tsx

@@ -4,7 +4,6 @@ import { mapApiErrorMessage } from "../api/errorMessages";
 import { isApiError } from "../api/types";
 import { useAuth } from "../auth/AuthContext";
 import { Button } from "../components/ui/button";
-import { Card } from "../components/ui/card";
 import { Input } from "../components/ui/input";
 import { Label } from "../components/ui/label";
 
@@ -59,7 +58,7 @@ export function LoginPage() {
   }
 
   return (
-    <Card className="space-y-6 border-primary-100 p-6">
+    <div className="card-std 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-zinc-900">登录工作台</h1>
@@ -106,6 +105,6 @@ export function LoginPage() {
           {submitting ? "登录中..." : "登录"}
         </Button>
       </form>
-    </Card>
+    </div>
   );
 }