fix(ConfirmDialog): 启用对话框关闭按钮

refactor(addCourse3): 重构年级选项处理逻辑
- 将gradeOptions重命名为gradeOptions2以提高可读性
- 移除冗余的成功提示代码

src/components/common/ConfirmDialog.vue

@@ -3,7 +3,7 @@
     <el-dialog
       :visible.sync="dialogVisible"
       width="400px"
-      :show-close="false"
+      :show-close="true"
       :before-close="handleClose"
       class="confirm_dialog_custom"
     >

src/components/pages/pptEasy/addCourse3.vue

@@ -833,7 +833,7 @@
               </div>
               <GradeClassSelector
                 v-model="checkboxList2"
-                :grade-options="gradeOptions"
+                :grade-options="gradeOptions2"
                 :class-options="classOptions"
                 :lang="lang"
                 @gradeChange="onGradeChange"
@@ -1186,6 +1186,7 @@ export default {
       selectedGrade: [],
       subjectOptions: [],
       gradeOptions: [],
+      gradeOptions2: [],
       avatar_loading: false,
       isAddOrUpdateLineLoading: false,
     };
@@ -1352,7 +1353,7 @@ export default {
       }));
       
       // 初始化年级选项，添加全部班级选项
-      this.gradeOptions = [
+      this.gradeOptions2 = [
         { id: '', name: this.lang.allGrades }
       ].concat(this.gradeArray.map(item => ({
         id: item.id,
@@ -1634,7 +1635,8 @@ export default {
       this.ajax
         .post(this.$store.state.api + "copyCourse2", params)
         .then((res) => {
-          this.$message.success(this.lang.Successfullycopy)
+          // this.$message.success(this.lang.Successfullycopy)
+          // this.showToast(this.lang.Successfullycopy);
         })
         .catch((err) => {
           console.error(err);