feat: add robust playwright login helper with captcha support

[NikkiAung]

Introduce optimized login() utility for Playwright crawler with captcha support

Adds a new login() utility function to the Playwright crawler that automatically handles website login forms, including optional captcha solving.

• Supports both one-step and two-step login flows.
• Allows custom locators and login success detection.
• Supports optional captcha handler with timeout.
• Optimized and refactored for robustness:
  • Clear error messages for all field interactions and button clicks.
  • Helper functions for field filling and captcha handling reduce code duplication.
  • Captcha handler is safely wrapped with timeout and error propagation.
  • Debug logging for each major login step.
  • Comprehensive test coverage for all scenarios, including captcha errors and timeouts.

async requestHandler({ login }) {
    await login({
        username: 'your-username',
        password: 'your-password',
        handleCaptcha: async (page) => {
            // Solve captcha here
        },
        captchaTimeoutMs: 20000,
        locators: {
            getUsernameInput: (page) => page.locator('#username'),
            getPasswordInput: (page) => page.locator('#password'),
            getSubmitButton: (page) => page.getByText('submit'),
            getNextButton: (page) => page.getByText('next'),
        },
        detectLoginSuccess: async (page) => {
            return page.locator('.user-menu').isVisible();
        },
        timeoutMs: 15_000,
    });
}

Resolves full features for Playwright #3040