fix: hide smart split tags area when no valid fragments are parsed in scanner dialog

inventory-web/src/components/SmartScannerDialog.vue

@@ -28,8 +28,8 @@
         <div class="raw-text">{{ rawText }}</div>
       </div>
 
-      <!-- 智能切割标签 -->
-      <div class="smart-tags">
+      <!-- 智能切割标签 - 仅当有多个有效片段时显示 -->
+      <div v-if="splitSegments.length > 1" class="smart-tags">
         <div class="label">智能切割（点击标签提取）：</div>
         <div class="tags-container">
           <el-tag
@@ -162,8 +162,8 @@ const handleScanSuccess = (text: string) => {
 }
 
 const splitText = (text: string) => {
-  // 使用正则表达式智能切割
-  const segments = text.split(/[;,\s_\|:]+/).filter(s => s.trim().length > 0)
+  // 使用正则表达式智能切割，过滤空字符串
+  const segments = text.split(/[;,\s_\|:]+/).filter(s => s && s.trim().length > 0)
   splitSegments.value = segments
   if (segments.length > 0) {
     selectedSegmentIndex.value = 0