feat: 修改导入处理逻辑以支持状态持久化

- handleFileSuccess: 清除旧数据,保存新任务初始状态
- handleImportComplete: 更新localStorage中的完整任务状态

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

ruoyi-ui/src/views/ccdiEmployee/index.vue

@@ -687,6 +687,26 @@ export default {
       if (response.code === 200) {
         const taskId = response.data.taskId;
 
+        // 清除旧的导入记录(防止并发)
+        if (this.pollingTimer) {
+          clearInterval(this.pollingTimer);
+          this.pollingTimer = null;
+        }
+
+        this.clearImportTaskFromStorage();
+
+        // 保存新任务的初始状态
+        this.saveImportTaskToStorage({
+          taskId: taskId,
+          status: 'PROCESSING',
+          timestamp: Date.now(),
+          hasFailures: false
+        });
+
+        // 重置状态
+        this.showFailureButton = false;
+        this.currentTaskId = taskId;
+
         // 显示后台处理提示
         this.$notify({
           title: '导入任务已提交',