feat: add mfa flow to the expo app

[blakecduncan]

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)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint:check) and fix any issues? (yarn lint:write)
• Did you follow the contribution guidelines?

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PR-Codex overview

This PR introduces Multi-Factor Authentication (MFA) functionality to the application, enhancing security by allowing users to verify their identity through an authenticator app. It includes new screens and updates to existing components to handle MFA processes.

Detailed summary

• Added a new MFAScreen component for managing MFA settings.
• Updated OTPAuthScreen to include MFA verification.
• Introduced handleMfaSubmit function for MFA code validation.
• Updated Tabs in _layout.tsx to include an MFA tab.
• Modified OAuth logic to support MFA.
• Updated dependencies in package.json to newer versions.
• Enhanced SplashScreen.storyboard with multiple background color entries.
• Adjusted styles for better UI presentation in MFA screens.

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Name	Status	Preview	Comments	Updated (UTC)
aa-sdk-site	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 17, 2025 5:22pm
aa-sdk-ui-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 17, 2025 5:22pm

[moldy530]

can you post a video of the flow