feat(onboarding): require a professional email on the personalize step

[jul-dan]

Summary

Issue: QOV-2069

Summary

• Reject sign-ups using free/personal/disposable email providers (Gmail, Yahoo, Outlook, iCloud, etc.) on the onboarding "Personalize" step — only professional email addresses are accepted now.
• Fix a related UX issue: the email field was silently pre-filled with the user's Auth0 social login email, which could be a personal address — this failed validation with no visible error and left the "Continue" button permanently disabled. The field is now left empty in that case, and its label is renamed to "Professional email address" to set expectations upfront.

Changes

• Added personal-email-domains.ts: a Set of ~4,768 known personal/free/disposable email domains, plus an isPersonalEmail() helper.
• step-personalize.tsx: new validate rule on the user_email field, error message "Please enter your professional email address."
• personalize.tsx: don't default user_email to the social-login email when it's a personal domain.
• Exported isPersonalEmail fros public API (index.ts) so it's reusable across the flow.
• Updated/added unit tests in step-personalize.spec.tsx.

Screenshots / Recordings

Testing

• Changes tested locally in the relevant Console's pages and Storybooks
• yarn test or yarn test -u (if you need to regenerate snapshots)
• yarn format
• yarn lint

PR Checklist

• I followed naming, styling, and TypeScript rules (see .cursor/rules)
• I performed a self-review (diff inspected, dead code removed)
• I titled the PR using Conventional Commits with a scope when possible (e.g. feat(service): add new Terraform service) - required for semantic-release
• I only kept necessary comments, written in English (watch for useless AI comments)
• I involved a designer to validate UI changes if I am not a designer
• I covered new business logic with tests (unit)
• I confirmed CI is green (Codecov red can be accepted)
• I reviewed and executed locally any AI-assisted code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.12%. Comparing base (c347652) to head (2d63eb5).

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #2798      +/-   ##
===========================================
+ Coverage    46.92%   54.12%   +7.20%     
===========================================
  Files         1251       13    -1238     
  Lines        26771      303   -26468     
  Branches      7804       65    -7739     
===========================================
- Hits         12562      164   -12398     
+ Misses       12052      128   -11924     
+ Partials      2157       11    -2146     

Flag	Coverage Δ
unittests	54.12% <100.00%> (+7.20%)	⬆️

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[RemiBonnet]

🎉 This PR is included in version 1.326.0 🎉

The release is available on GitHub release

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