fix(editor): 画布右键菜单中粘贴按钮显示条件修改

packages/editor/src/layouts/workspace/ViewerMenu.vue

@@ -3,7 +3,7 @@
 </template>
 
 <script lang="ts" setup>
-import { computed, inject, markRaw, onMounted, reactive, ref, watch } from 'vue';
+import { computed, inject, markRaw, reactive, ref, watch } from 'vue';
 import { Bottom, Delete, DocumentCopy, Top } from '@element-plus/icons-vue';
 
 import { MNode, NodeType } from '@tmagic/schema';
@@ -133,11 +133,6 @@ const menuData = reactive<MenuItem[]>([
  ...stageContentMenu,
 ]);
 
-onMounted(async () => {
- const data = await storageService.getItem(COPY_STORAGE_KEY);
- canPaste.value = data !== 'undefined' && !!data;
-});
-
 watch(
  parent,
  async () => {
@@ -152,8 +147,10 @@ watch(
  { immediate: true },
 );
 
-const show = (e: MouseEvent) => {
+const show = async (e: MouseEvent) => {
  menu.value?.show(e);
+ const data = await storageService.getItem(COPY_STORAGE_KEY);
+ canPaste.value = data !== 'undefined' && !!data;
 };
 
 defineExpose({ show });