Registering with an email that already has an account previously just
failed with a generic error and no clear next step. registerCustomer()
now flags emailExists specifically, and checkout switches straight to the
login toggle (email pre-filled, scrolled into view) instead. The account
icon also gets a small underline while logged in, matching the nav links'
active-state styling — it was otherwise the only nav element that gave no
visual signal of session state.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Marco
ec75a480bd