style(PdfViewer): 调整缩放控制按钮的布局顺序

 <!--
  * @Date: 2025-01-21
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-10-22 11:21:20
+ * @LastEditTime: 2025-10-22 11:39:56
  * @FilePath: /mlaj/src/components/ui/PdfViewer.vue
  * @Description: PDF预览组件 - 使用pdf-vue3库
 -->
@@ -55,9 +55,9 @@
             <!-- 缩放控制按钮 -->
             <div v-if="!loading && !loadingError" class="zoom-controls">
                 <van-button class="zoom-btn zoom-close-btn" type="default" icon="cross" round @click="handleClose" />
-                <van-button class="zoom-btn zoom-out-btn" type="default" icon="minus" round @click="zoomOut" />
-                <div class="zoom-level">{{ Math.round(zoomLevel * 100) }}%</div>
                 <van-button class="zoom-btn zoom-in-btn" type="default" icon="plus" round @click="zoomIn" />
+                <div class="zoom-level">{{ Math.round(zoomLevel * 100) }}%</div>
+                <van-button class="zoom-btn zoom-out-btn" type="default" icon="minus" round @click="zoomOut" />
                 <van-button class="zoom-btn zoom-reset-btn" type="default" round @click="resetZoom">
                     <van-icon name="replay" size="16" />
                 </van-button>