Admin error email now includes: Square error code, category, and
detail string; full customer name/email/phone; fulfillment type,
address, date/time, and delivery instructions; per-item options,
colors, and notes; itemised price breakdown with delivery and
estimated tax; idempotency key for debugging.
Customer invoice mailto now includes: full name/email/phone; per-item
options, colors, and notes; delivery date, address, and instructions;
itemised subtotal/delivery/tax/total breakdown.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>