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

client/src/components/common/CardSkeleton.tsx

@@ -1,13 +1,12 @@
 import { Skeleton } from "../ui/skeleton";
-import { Card } from "../ui/card";
 
 export function CardSkeleton({ lines = 6 }: { lines?: number }) {
   return (
-    <Card className="space-y-3 p-6">
+    <div className="card-std space-y-3 p-6">
       <Skeleton className="h-5 w-48" />
       {Array.from({ length: lines }, (_, i) => (
         <Skeleton key={i} className="h-4 w-full" />
       ))}
-    </Card>
+    </div>
   );
 }

client/src/components/common/ErrorBoundary.tsx

@@ -1,5 +1,4 @@
 import { Component, type ErrorInfo, type ReactNode } from "react";
-import { Card } from "../ui/card";
 
 type Props = {
   children: ReactNode;
@@ -32,7 +31,7 @@ export class ErrorBoundary extends Component<Props, State> {
       }
 
       return (
-        <Card className="mx-auto mt-12 max-w-lg space-y-4 p-6 text-center">
+        <div className="card-std mx-auto mt-12 max-w-lg space-y-4 p-6 text-center">
           <h2 className="text-lg font-semibold text-zinc-900">页面渲染出错</h2>
           <p className="text-sm text-zinc-600">
             {this.state.error?.message ?? "发生了未知错误"}
@@ -55,7 +54,7 @@ export class ErrorBoundary extends Component<Props, State> {
               返回首页
             </button>
           </div>
-        </Card>
+        </div>
       );
     }