fix:修复获取不到学科名称的错误

src/components/exam/ExamDialog.vue

@@ -71,6 +71,7 @@ const confirmClick = async (formEl: FormInstance | undefined) => {
 }
 
 const generateExam = async () => {
+  libraryStore.selectedSubject = examStore.config.subject
   questionStore.questionContent = ''
 
   const loading = ElLoading.service({

src/components/question/QuestionList.vue

@@ -83,7 +83,7 @@ const addRecord = async () => {
     correctCount,
     wrongCount
   }
-  await recordStore.addRecord(libraryStore.currentFile.subject)
+  await recordStore.addRecord(libraryStore.selectedSubject as string)
 
   await ElMessageBox.alert(
     `共 ${totalCount} 题 · 正确 ${correctCount} · 错误 ${wrongCount}`,
@@ -107,7 +107,7 @@ const addMistakeList = async () => {
     }
     mistakeStore.currentMistakes.push(mistake)
   })
-  await mistakeStore.addMistakeList(libraryStore.currentFile.subject)
+  await mistakeStore.addMistakeList(libraryStore.selectedSubject as string)
 }
 </script>