fix(web): correct monitoring empty states and Space request headers

web/src/app/home/pipelines/PipelineMigration.tsx

@@ -340,16 +340,12 @@ export default function PipelineMigration({
 
   return (
     <>
-      {(count > 0 || previewError || results.length > 0) && (
+      {(count > 0 || results.length > 0) && (
         <Alert className="mb-4 shrink-0 border-amber-200 bg-amber-50 text-amber-900 dark:border-amber-900/50 dark:bg-amber-950/30 dark:text-amber-200">
           <AlertTriangle aria-hidden="true" />
           <AlertTitle>{t('pipelineMigration.title')}</AlertTitle>
           <AlertDescription className="flex items-center justify-between gap-3 text-amber-800 dark:text-amber-200">
-            <span>
-              {previewError
-                ? t('pipelineMigration.previewError')
-                : t('pipelineMigration.detected', { count })}
-            </span>
+            <span>{t('pipelineMigration.detected', { count })}</span>
             <Button
               variant="outline"
               size="sm"

web/src/app/infra/http/BaseHttpClient.ts

@@ -4,6 +4,7 @@ import axios, {
   AxiosResponse,
   AxiosError,
 } from 'axios';
+import i18n from 'i18next';
 import {
   clearActiveWorkspaceUuid,
   getActiveWorkspaceUuid,
@@ -79,6 +80,12 @@ export abstract class BaseHttpClient {
     // 请求拦截
     this.instance.interceptors.request.use(
       async (config) => {
+        // Account-only endpoints have no selected Workspace. Workspace routes
+        // resolve their persisted language and override this presentation hint.
+        // This is a LangBot backend hint, not part of the public Space API.
+        if (!this.disableToken) {
+          config.headers['X-LangBot-Language'] = i18n.language || 'en-US';
+        }
         // 客户端添加认证头
         if (typeof window !== 'undefined' && !this.disableToken) {
           const session = this.getSessionSync();