style(PdfViewer): 在页码显示中添加空格以提升可读性

 <!--
  * @Date: 2025-01-21
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-10-22 13:32:48
+ * @LastEditTime: 2025-10-22 13:36:27
  * @FilePath: /mlaj/src/components/ui/PdfViewer.vue
  * @Description: PDF预览组件 - 使用pdf-vue3库
 -->
@@ -58,7 +58,7 @@
                 <!-- <van-button class="zoom-btn zoom-in-btn" type="default" icon="plus" round @click="zoomIn" /> -->
                 <font-awesome-icon icon="magnifying-glass-plus" class="text-2xl text-gray-600 ml-2 mr-2" @click="zoomIn" />
                 <div class="page-jump" @click="focusPageInput">
-                    <span class="page-display">{{ currentPage }}/{{ totalPages || 0 }}</span>
+                    <span class="page-display">{{ currentPage }} / {{ totalPages || 0 }}</span>
                     <input
                         ref="pageInputRef"
                         class="page-input"