fix(CopyButton): use shadcn buttonVariants instead of duplicated variant classes

Remove hand-written variantClasses/sizeClasses that duplicated shadcn's
buttonVariants. Now extends ButtonProps and imports buttonVariants from
components/ui/button for consistent styling.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

components/CopyButton.tsx

@@ -1,23 +1,20 @@
 import React, { useEffect, useRef, useState } from 'react';
 import { Check, Copy } from 'lucide-react';
 import { copyTextToClipboard } from '@/utils/clipboard';
-import { cn } from '@/lib/utils'; // 1. 必须使用 cn 工具函数
-import { toast } from 'sonner'; // 2. 推荐使用 shadcn 默认的全局 toast
+import { cn } from '@/lib/utils';
+import { buttonVariants, type ButtonProps } from '@/components/ui/button';
+import { toast } from 'sonner';
 
-// 3. 继承原生按钮属性，允许外部自由扩展 className、variant 等
-interface CopyButtonProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
+interface CopyButtonProps extends Omit<ButtonProps, 'children' | 'onClick'> {
   text: string;
   tooltip?: string;
-  size?: 'small' | 'medium' | 'large';
-  // 移除复杂的自定义颜色变体，交由 Tailwind 类名或 shadcn 的 variant 解决
-  variant?: 'default' | 'secondary' | 'ghost' | 'outline';
 }
 
 export const CopyButton: React.FC<CopyButtonProps> = ({
   text,
   tooltip = '复制',
-  size = 'small',
   variant = 'ghost',
+  size = 'sm',
   className,
   ...props
 }) => {
@@ -31,7 +28,7 @@ export const CopyButton: React.FC<CopyButtonProps> = ({
   }, []);
 
   const handleCopy = async (e: React.MouseEvent<HTMLButtonElement>) => {
-    e.stopPropagation(); // 基础组件防冒泡，避免触发父级点击事件
+    e.stopPropagation();
 
     if (!text) {
       toast.error('无内容可复制');
@@ -49,35 +46,17 @@ export const CopyButton: React.FC<CopyButtonProps> = ({
     }
   };
 
-  // 4. 将控制尺寸的类名标准化
-  const sizeClasses = {
-    small: 'h-8 w-8 text-xs',
-    medium: 'h-10 w-10 text-sm',
-    large: 'h-12 w-12 text-base',
-  };
-
-  // 5. 映射 shadcn 的底层通用 Variant 类名
-  const variantClasses = {
-    default: 'bg-primary text-primary-foreground shadow hover:bg-primary/90',
-    secondary: 'bg-secondary text-secondary-foreground shadow-sm hover:bg-secondary/80',
-    ghost: 'hover:bg-accent hover:text-accent-foreground',
-    outline:
-      'border border-input bg-background shadow-sm hover:bg-accent hover:text-accent-foreground',
-  };
-
   return (
     <button
       type="button"
       onClick={handleCopy}
       title={tooltip}
-      // 6. 使用 cn() 合并类名，并完美支持暗黑模式的语义化变量 (destructive/muted等)
       className={cn(
-        'inline-flex items-center justify-center rounded-md font-medium transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring disabled:pointer-events-none disabled:opacity-50',
-        sizeClasses[size],
-        copied
-          ? 'bg-emerald-500/10 text-emerald-600 dark:text-emerald-400' // 兼顾暗黑模式的成功色
-          : variantClasses[variant],
-        className, // 允许外部直接传入 text-red-500 等覆盖样式
+        buttonVariants({ variant, size }),
+        'h-8 w-8',
+        copied &&
+          'bg-emerald-500/10 text-emerald-600 dark:text-emerald-400 hover:bg-emerald-500/10',
+        className,
       )}
       {...props}
     >