feat(i18n): extract keys from onboarding tour

[max-datahub]

Summary

Extracts hardcoded strings from the onboarding product-tour configs and modals into a new onboarding react-i18next namespace.

• New en/onboarding.json (171 keys) grouped by tour/page: home, search, entityProfile (+ entityProfileV2), glossary, domains, users, groups, roles, policies, ingestion, lineageGraph, welcome (modal), tour. Rich step content (paragraphs with <strong>, "Learn more … here" links, bullet lists, keyboard-shortcut hints) uses <Trans> with bold/anchor slots; 10 keys are shared across the V1/V2 HomePage & EntityProfile configs.
• No refactor: the config step arrays stay module-scope consts and use <Trans> (which defers translation to render), so OnboardingConfig/utils.tsx and their 10+ consumers are untouched. WelcomeToDataHubModal and OnboardingTour are real components and use useTranslation('onboarding').
• Reuses common.feedback.loading and common.labels.owners/tags/columns — 0 new common keys.
• Registers the namespace in i18n.ts + setupTests.ts; tracks the dir in translated-files.txt.
• Normalizes source copy: '→', Datahub→DataHub, standarized→standardized, and a "Lineage have"→"Lineage has" grammar fix.

EN-only; German translation follows in a separate PR.

Pages to verify

The tour is triggered on first visit to each area (or any time via Cmd + Ctrl + T). With a non-English locale, trigger the tour and check the rich content renders/fits:

• Home — Welcome modal + ingestion / domains / platforms / most-popular / search-bar steps (V1 and V2 home)
• Entity profile — entities / properties / documentation / lineage / schema tab steps + owners / tags / glossary-terms / domain sidebar steps (V1 and V2)
• Search results — filters / advanced / browse / "filters moved" steps
• Business Glossary, Domains, Users, Groups, Roles, Policies, Ingestion, Lineage graph — each page's tour steps (incl. the "Learn more … here" doc links)
• Welcome to DataHub modal — 5 carousel slides + "Get started"

Checklist

• PR title follows Conventional Commits
• tsc --noEmit, ESLint, Prettier, and Vitest (19/19) pass locally
• Docs added/updated (n/a — UI string extraction)
• Breaking changes (none)

🤖 Generated with Claude Code

[codecov]

Bundle Report

Changes will increase total bundle size by 15.78kB (0.07%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
datahub-react-web-esm	23.42MB	15.78kB (0.07%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: datahub-react-web-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
assets/index-*.js	-1.83kB	8.82MB	-0.02%
assets/en-*.js	17.61kB	147.44kB	13.56% ⚠️

Files in assets/index-*.js:

• ./src/app/onboarding/WelcomeToDataHubModal.tsx → Total Size: 9.29kB

• ./src/app/onboarding/config/EntityProfileOnboardingConfig.tsx → Total Size: 10.03kB

• ./src/app/onboarding/config/HomePageOnboardingConfig.tsx → Total Size: 5.82kB

• ./src/app/onboarding/config/PoliciesOnboardingConfig.tsx → Total Size: 2.15kB

• ./src/app/onboarding/config/DomainsOnboardingConfig.tsx → Total Size: 1.87kB

• ./src/app/onboarding/OnboardingTour.tsx → Total Size: 4.13kB

• ./src/app/onboarding/configV2/EntityProfileOnboardingConfig.tsx → Total Size: 9.46kB

• ./src/i18n/i18n.ts → Total Size: 8.31kB

• ./src/app/onboarding/WelcomeToDataHubModal.components.tsx → Total Size: 3.06kB

• ./src/app/onboarding/config/IngestionOnboardingConfig.tsx → Total Size: 1.77kB

• ./src/app/onboarding/config/RolesOnboardingConfig.tsx → Total Size: 1.55kB

• ./src/app/onboarding/config/GroupsOnboardingConfig.tsx → Total Size: 2.11kB

• ./src/app/onboarding/configV2/HomePageOnboardingConfig.tsx → Total Size: 6.95kB

• ./src/app/onboarding/config/LineageGraphOnboardingConfig.tsx → Total Size: 1.91kB

• ./src/app/onboarding/config/BusinessGlossaryOnboardingConfig.tsx → Total Size: 3.38kB

• ./src/app/onboarding/config/SearchOnboardingConfig.tsx → Total Size: 2.14kB

• ./src/app/onboarding/config/UsersOnboardingConfig.tsx → Total Size: 4.06kB

Files in assets/en-*.js:

• ./src/i18n/locales/en/onboarding.json → Total Size: 18.15kB

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
datahub-web-react/src/i18n/i18n.ts	0.00%	1 Missing ⚠️

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