Add a test for the magic link flow. The test should:

• Start on the home page
• Navigate to auth by clicking the "Sign In" button
• Enter a test email address into the magic link form
• Click the "Send me a magic link" button
• Find the magic link in the email inbox (this is the harder part)
• Follow the magic link
• Confirm the user was signed in and redirected to the /docs/new page