fix: hide verbose feedback on mobile

src/pages/PerformanceDomainPracticePage.tsx

@@ -607,7 +607,7 @@ export default function PerformanceDomainPracticePage() {
                   <div>
                     <div
                       className={clsx(
-                        'flex items-center gap-2 text-sm font-semibold',
+                        'hidden items-center gap-2 text-sm font-semibold sm:flex',
                         answerState.isCorrect
                           ? 'text-emerald-700 dark:text-emerald-300'
                           : 'text-rose-700 dark:text-rose-300'
@@ -619,7 +619,7 @@ export default function PerformanceDomainPracticePage() {
                         : `错误：你选了 ${selectedDomain?.name ?? ''}`}
                     </div>
                     {!answerState.isCorrect && (
-                      <p className="mt-1 text-sm text-gray-700 dark:text-gray-300">
+                      <p className="mt-1 hidden text-sm text-gray-700 dark:text-gray-300 sm:block">
                         正确答案：{currentDomain.name}
                       </p>
                     )}