docs(experiment-center): add usage examples and tests for variant override

[siddhikotak]

Summary

Adds support for forcing an Experiment Center variant via experiment_id, variation_id, and optional segment_id.

• Adds experiment_id, variation_id, and segment_id as named, typed string fields on AuthorizationParameters.
  Fields come from @auth0/auth0-spa-js and are re-exported unchanged on AuthorizationParams.
• Forwarded to /authorize through the existing authorizationParams pass-through - no runtime logic changes needed.
• Adds unit tests + README.md/EXAMPLES.md docs.

Test plan

• npm test — passes, 100% coverage held
• New tests forward the params through loginWithRedirect (with and without segment_id)
• README.md / EXAMPLES.md render correctly

Summary by CodeRabbit

• Documentation
  • Added guidance for selecting an Experiment Center variant on an individual login request using experiment_id, variation_id, and an optional segment_id.
  • Includes examples for redirect and popup login, and notes that the selection applies only to that request.
  • Clarifies that parameters should be passed to the login call rather than configured on the provider, to avoid affecting silent token renewal. Experiment Center support is in Early Access.

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📥 Commits

Reviewing files that changed from the base of the PR and between 6bd1fa2 and b666d58.

📒 Files selected for processing (1)

• EXAMPLES.md

🚧 Files skipped from review as they are similar to previous changes (1)

• EXAMPLES.md

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📝 Walkthrough

Walkthrough

The README and examples document how to pass Experiment Center variant parameters on login calls. Tests verify parameter forwarding through loginWithRedirect and loginWithPopup.

Changes

Experiment Center variant overrides

Layer / File(s)	Summary
Document per-call variant parameters README.md, EXAMPLES.md	Documentation describes per-call experiment_id, variation_id, and optional segment_id parameters for redirect and popup login calls. It notes that provider-level parameters also reach silent renewal calls and that the override applies only to the request.
Verify login parameter forwarding __tests__/auth-provider.test.tsx	Tests verify that redirect and popup login calls forward the required parameters, with and without segment_id.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: amitsingh05667

Merge Risk: ⚪ Minimal · up to b666d

No specific issue is established that should prevent merging; complete the planned tests and documentation checks.

🚥 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. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the documented Experiment Center variant override examples and related tests added in the pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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