feat: 本次提交更新内容如下

存一版样式问题

nkebao/src/components/PageHeader.tsx

@@ -23,8 +23,6 @@ interface PageHeaderProps {
   backButtonVariant?: 'icon' | 'button' | 'text';
   /** 返回按钮自定义样式类名 */
   backButtonClassName?: string;
-  /** 是否固定在顶部 */
-  fixed?: boolean;
   /** 是否显示底部边框 */
   showBorder?: boolean;
 }
@@ -44,14 +42,13 @@ export const PageHeader: React.FC<PageHeaderProps> = ({
   titleClassName = '',
   backButtonVariant = 'icon',
   backButtonClassName = '',
-  fixed = true,
   showBorder = true
 }) => {
   const { goBack } = useSimpleBack(defaultBackPath);
 
   const handleBack = onBack || goBack;
 
-  const baseClasses = `bg-white ${showBorder ? 'border-b border-gray-200' : ''} ${fixed ? 'fixed top-0 left-0 right-0 z-20' : ''}`;
+  const baseClasses = `bg-white ${showBorder ? 'border-b border-gray-200' : ''}`;
   const headerClasses = `${baseClasses} ${className}`;
   // 默认小号按钮样式
   const defaultBackBtnClass = 'text-sm px-2 py-1 h-8 min-h-0';