fix[design]: 在创建页面添加保存提示

- 增加 Dialog 取提示是否保存
- 去除多余的 watch 导入

src/views/Design/components/Questions/SignQuestion.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { computed, onMounted, ref, useTemplateRef, onUnmounted, watch } from 'vue';
+import { computed, onMounted, ref, useTemplateRef, onUnmounted } from 'vue';
 import { useRoute } from 'vue-router';
 import { showConfirmDialog } from 'vant';