Refactor login command to use browser-based magic link request

[Copilot]

Updates the authentication flow to offload the magic link request to the web interface rather than initiating it via the API from the CLI.

Changes

• Login Command: Replaced the email collection and requestMagicLink API call with a browser redirect using the open package.
• CLI Interface: Removed the --email flag and updated user prompts to guide the context switch between the terminal and the browser.
• Tests: Added src/commands/login.test.ts to verify the browser launch and subsequent token exchange flow.

Implementation

// src/commands/login.ts
console.log('We are about to open a browser window for you to log in to Forma...');
await open('https://client.joinforma.com/login?type=magic');

const { id, tk } = promptForEmailedMagicLink();
const accessToken = await exchangeIdAndTkForAccessToken(id, tk);
storeConfig({ accessToken });

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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