Mirrors the same Provider & Location page pattern from the eligibility worker: - wait for paymentGroupId label visibility before interacting - Treatment Location: ng-arrow-wrapper click + ARROW_DOWN/ENTER - Billing Entity: ng-arrow-wrapper click + ARROW_DOWN/ENTER - re-find Continue button after selections to avoid stale element Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>