User Auth

[cboiteux2765]

Description

Added user auth for creating/signing in and logging out of account with Google IdP (OAuth2) and stores user info in Amazon Cognito user pool.

Related issue(s)

Closes #5
Issue: #5

Type of change

• Bug fix
• [ X ] New feature
• Breaking change
• Documentation update

How did you test this?

npm run dev to launch localhost:3000 and tried the following:

• Creating a new account (Google asks for permission to use profile data)
• Signing in to another account while signed in to another
• Signing in to an existing account
• Signing out
• It shows which account you're signed in to

Checklist

• [ X ] I have performed a self-review of my own code.
• [ X ] I have commented my code, particularly in hard-to-understand areas.

GenAI usage

• What model(s) did you use? GPT-5.3 Codex (Longer reasoning)
• Percent of AI-written code? 100
• Any drawbacks? Some issues but easily fixed

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