fix(图片预览): 隐藏预览组件的索引显示并修正描述文本

将图片预览组件的索引显示关闭，并统一将"头像"相关描述改为"封面"

 <!--
  * @Date: 2025-08-27 17:44:53
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-09-11 11:06:38
+ * @LastEditTime: 2025-09-11 19:55:19
  * @FilePath: /lls_program/src/pages/CreateFamily/index.vue
  * @Description: 文件描述
 -->
@@ -153,6 +153,7 @@
       v-model:show="previewVisible"
       :images="previewImages"
       :init-no="previewIndex"
+      :show-index="false"
       @close="closePreview"
     />
 

 <!--
  * @Date: 2025-08-27 17:44:53
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-09-11 10:41:23
+ * @LastEditTime: 2025-09-11 19:58:10
  * @FilePath: /lls_program/src/pages/EditFamily/index.vue
  * @Description: 文件描述
 -->
@@ -149,6 +149,7 @@
       v-model:show="previewVisible"
       :images="previewImages"
       :init-no="previewIndex"
+      :show-index="false"
       @close="closePreview"
     />
 
@@ -347,7 +348,7 @@ const uploadImage = (filePath) => {
 };
 
 /**
- * 预览头像
+ * 预览封面
  */
 const previewAvatar = () => {
   const imageToPreview = familyAvatar.value || defaultFamilyCover.value;
@@ -357,11 +358,11 @@ const previewAvatar = () => {
 };
 
 /**
- * 删除头像
+ * 删除封面
  */
 const deleteAvatar = () => {
   familyAvatar.value = '';
-  showToast('头像已删除', 'success');
+  showToast('封面已删除', 'success');
 };
 
 /**