- Set HTTP_REFERER in cancel action specs so they test the redirect to
the actual order page (not the cancel path, which was the implicit
referer in controller specs)
- Keep response.body match pattern (consistent with checkout_controller_spec
for CableReady redirects — redirect_to matcher does not work here since
the cancel action uses cable_car.redirect_to, not a Rails redirect)
- Remove doc/demo screenshots; images to be added to PR description instead
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
cc608adddc