fix: using enum instead of strings for auth step types

[jcaleb4]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
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PR-Codex overview

This PR introduces the AuthStepType enum to standardize the types used in authentication steps throughout the application. It replaces string literals with this enum to improve code maintainability and readability.

Detailed summary

• Introduced AuthStepType enum in context.ts.
• Replaced string literals with AuthStepType in various components and hooks.
• Updated setAuthStep calls to use the new enum values.
• Ensured consistent type checking across authentication steps.

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