Purple and blue envelope details were getting mixed up on both the
order form and the confirmation email. The purple screen no longer
asks about blue envelopes at all; the blue screen now owns the
provider question and always shows its permit questions (not just
when buying from KCI), and the order-confirmation email keeps purple
and blue answers in separate sections.

Also drop the blue page's visibleIf tied to the purple envelope
stock choice - it was hiding all blue questions for anyone using
their own purple stock, which is unrelated to blue envelope needs.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>