fix(data-management): 修复文件预览状态检查逻辑

- 移除 PENDING 状态的预览轮询检查
- 避免在 PENDING 状态下重复轮询导致的性能问题
- 优化预览加载状态管理流程

frontend/src/pages/DataManagement/Detail/useFilesOperation.ts

@@ -175,7 +175,7 @@ export function useFilesOperation(dataset: Dataset) {
           setPreviewLoading(false);
           return;
         }
-        if (currentStatus === "PROCESSING" || currentStatus === "PENDING") {
+        if (currentStatus === "PROCESSING") {
           pollOfficePreviewStatus(datasetId, file.id, 0);
           return;
         }