feat: change email validation rule

[tinaszheng]

We should only enable the "Submit" button if the email is valid - therefore we don't need the error state anymore 🤔
https://www.figma.com/design/5n3ACN3Z6PJjULtfXux5ay?node-id=19-2593#829800061

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

The focus of this PR is to update the EmailAuth component in the EmailAuth.tsx file to improve email validation and button disabling logic.

Detailed summary

• Updated validation trigger from onBlur to onChange for email input
• Removed error display logic
• Modified button disabled condition to also check for email presence

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