Wire the suite into CI

Make the suite CI-ready: configuration from environment variables and headless execution when running in a pipeline.

1. 1Read CI (set to true by GitHub Actions, GitLab CI and most runners) from the environment.
2. 2When CI is set, start Chrome with --headless=new and a fixed window size such as 1920,1080.
3. 3Allow the URL to be overridden by an environment variable, falling back to TEST_URL.
4. 4Sign in with qa@target.dev / Test@123 (#username, #password, #login-button). Assert the dashboard; a failing assertion must fail the build.

• Environment variables drive the configuration
• Headless mode is enabled for CI
• The dashboard is shown
• At least 1 assertion passes

username

qa@target.dev

password

Test@123