Replace terminal email prompt with browser-based magic link flow

[Copilot]

The login command now opens a browser to Forma's login page instead of prompting for email in the terminal and making an API call.

Changes:

• Opens https://client.joinforma.com/login?type=magic in user's default browser
• Removed terminal email input and validation (promptForEmail, email regex)
• Removed requestMagicLink() API call
• Removed --email CLI option
• Added instructional messages before browser launch
• Preserves any existing stored email for backward compatibility

New flow:

// Before: Terminal prompts for email, sends API request
const email = opts.email ?? promptForEmail();
await requestMagicLink(email);
const { id, tk } = promptForEmailedMagicLink(email);

// After: Opens browser, user handles email entry there
console.log(chalk.cyan('\nWe will now open your browser to the Forma login page.'));
console.log('Please enter your email address there and request a magic link.');
console.log('Once you receive the magic link in your email, come back to this terminal and paste it below.\n');
await open('https://client.joinforma.com/login?type=magic');
const { id, tk } = promptForEmailedMagicLink();

User still pastes the received magic link into the terminal as before.

Dependencies:

• Added open@^10.2.0 for browser automation

Original prompt

Update the login command so that instead of collecting a user's email and pinging it to Forma yo get a magic link, it pops open a browser to https://client.joinforma.com/login?type=magic to enter the email and request the link. The flow afterwards where the user pastes the magic link into the terminal should be the same. Before popping open the browser, explain what is going to happen and that they need to enter their email, get the magic link, and then come back to the terminal to paste.

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