[Easy] Add back extra fields guest auth test

[nezaj]

Follow up from #2833

Once we deploy the backend changes this should pass CI!

[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request activates the guest-user extraFields end-to-end test. The test signs in a guest, verifies guest status, queries the created user, and checks that the username and display name fields persist.

Changes

Guest extraFields validation

Layer / File(s)	Summary
Activate guest extraFields test client/packages/core/__tests__/src/auth-extra-fields.e2e.test.ts	The test signs in a guest with username and display name fields. It verifies guest status and persisted field values.

Estimated code review effort: 2 (Simple) | ~5 minutes

Possibly related PRs

• instantdb/instant#2394: Re-enables a guest-user extraFields test in the same test file.
• instantdb/instant#2833: Introduces the guest extraFields end-to-end test that this change activates.

Suggested reviewers: stopachka

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly identifies the restored guest authentication test for extra fields.
Description check	✅ Passed	The description explains that the test follows PR #2833 and depends on backend deployment.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sm-e2e-extra-fields-test

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[github-actions]

View Vercel preview at instant-www-js-sm-e2e-extra-fields-test-jsv.vercel.app.