test: add comprehensive Jest tests for CustomPage and WorkflowOnboardingModal components (#29714)

web/app/components/datasets/common/document-picker/index.spec.tsx

@@ -5,13 +5,6 @@ import type { ParentMode, SimpleDocumentDetail } from '@/models/datasets'
 import { ChunkingMode, DataSourceType } from '@/models/datasets'
 import DocumentPicker from './index'
 
-// Mock react-i18next
-jest.mock('react-i18next', () => ({
-  useTranslation: () => ({
-    t: (key: string) => key,
-  }),
-}))
-
 // Mock portal-to-follow-elem - always render content for testing
 jest.mock('@/app/components/base/portal-to-follow-elem', () => ({
   PortalToFollowElem: ({ children, open }: {

web/app/components/datasets/common/document-picker/preview-document-picker.spec.tsx

@@ -3,7 +3,7 @@ import { fireEvent, render, screen } from '@testing-library/react'
 import type { DocumentItem } from '@/models/datasets'
 import PreviewDocumentPicker from './preview-document-picker'
 
-// Mock react-i18next
+// Override shared i18n mock for custom translations
 jest.mock('react-i18next', () => ({
   useTranslation: () => ({
     t: (key: string, params?: Record<string, unknown>) => {