High-friction conversion points (payment step, review step, order intro) had
almost no trust reinforcement at the moment of payment. Adds a shared,
regulator-agnostic CheckoutTrustBand component used across all four verticals:
- Payment step: 'full' variant -- money-back-if-we-fail-to-file guarantee +
256-bit TLS / Stripe / SOC 2 / PCI / fixed-price security badges + the right
'not affiliated with <agency>' disclaimer for the vertical.
- Review step: 'compact' variant -- guarantee + disclaimer (no badges).
- Order intro (VerticalOrderHeader, shared by all 49 order pages): thin green
'Secure checkout / Fixed price / Money-back guarantee' bar.
Guarantee copy is a real promise (full refund if we cannot file), worded so it
never overpromises a regulatory outcome (agency approval is not ours to give).
Vertical is inferred from the intake-step list via slugVertical() (single
source of truth, no hand-maintained slug table), with an explicit corporate
slug set since corporate services share the generic 'entity' step. Note: the
'dc_agent' step is the telecom D.C. process-agent designation, not corporate.
Also fixes two pre-existing mislabeled order-page headers surfaced by an
exhaustive header-vs-disclaimer audit: rmd-filing (Robocall Mitigation DB) and
new-carrier-bundle (VoIP carrier onboarding) are telecom, not healthcare/
trucking.