Add an option to hide or remove the invoice/bill number on printed private billing receipts

Affected users: Medical Office Assistants (MOAs) and clinic administrative staff handling private billing checkout and receipt printing for patients.

Task affected: Patient file > Private billing module. When generating and printing the final private bill/receipt to hand to the patient.

Impact: Daily occurrence for clinics issuing private billing receipts. Staff face client friction and perceived privacy/confidentiality concerns from patients regarding visible internal invoice numbering.

Current state: Clinic staff currently print the standard receipt without modification, as manually scribbling over or blacking out the invoice number on every printed copy is inefficient and unprofessional.