Build a Form

When building a form:

1. Define the form fields, their types, and validation rules.
2. Create the form component with controlled inputs and labels.
3. Add client-side validation with clear, specific error messages per field.
4. Add a submit handler that disables the button during submission and shows a loading state.
5. Handle the API response: show a success message or display server-side errors mapped to the correct fields.
6. Test with valid data, empty fields, invalid formats, and rapid double-submission.
7. Verify keyboard navigation: Tab through all fields, submit with Enter.