feat: oauth add passkey after signup (redirect flow)

[linnall]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
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PR-Codex overview

This PR introduces enhancements to user signup flow, particularly focusing on handling new users and passkey creation. It adds new event listeners, modifies existing components, and updates state management to improve user experience during authentication.

Detailed summary

• Added createPasskeyAfter option to the authentication context.
• Introduced newUserSignup event in AlchemySignerEvents.
• Updated useNewUserSignup hook to handle new user signups.
• Modified AuthModal to open for passkey creation if required.
• Changed useBreakpoint to return undefined for initial state.
• Enhanced BaseAlchemySigner to manage isNewUser state.
• Updated AuthCardContent to handle authentication state based on isConnected.

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[dphilipson]

This is looking good! Left a few comments.