E2E Tests for a Multi-Step Form Wizard

Problem/Feature Description

A web application has a multi-step form wizard for user onboarding. Write Cypress E2E tests covering each step and the full completion flow.

The app runs on http://localhost:3000 with these pages:

• /onboarding -- multi-step wizard with 3 steps:
  1. Personal info -- first name, last name, email fields with a "Next" button
  2. Preferences -- notification toggle, theme selector (light/dark), language dropdown, with "Back" and "Next" buttons
  3. Review and confirm -- summary of entered data with "Back" and "Submit" buttons
• /welcome -- success page shown after completing onboarding

The app has these API endpoints:

• POST /api/onboarding -- submits the completed onboarding data
• GET /api/onboarding/validate -- validates form data for the current step

Form validation rules:

• First name and last name are required (minimum 2 characters)
• Email must be a valid email format
• All fields on a step must be valid before "Next" is enabled

Output Specification

Produce:

• cypress.config.ts -- Cypress configuration
• cypress/e2e/onboarding.cy.ts -- tests for the multi-step wizard (navigation, validation, submission)
• cypress/support/commands.ts -- any reusable test helpers
• package.json -- with cypress dependency listed

You may create additional files for good test organization.