fix: unify product detail back button with top mask style

src/pages/designList/index.tsx

@@ -125,7 +125,6 @@ export default function DesignListPage() {
       <LoginGuard>
         <View className='design-page'>
           <View className='page-header design-header' style={{ paddingTop: `${safe.statusBarHeight + 12}px` }}>
-            <View className='header-spacer' />
             <Text className='header-title'>我的设计清单</Text>
             <View className='header-manage' onTap={handleManage}>
               <Text>{managing ? '完成' : '管理'}</Text>