Problem

Currently users can only Print or Email invoices. There is no way
to export an invoice as a PDF or save it as a portable file for
archiving — which is essential for government billing use cases.

Expected Behaviour

A "Export as PDF" option in the action sheet menu that:

• Opens a print-ready view of the invoice
• Allows saving as PDF via the browser print dialog
• Also provides a downloadable HTML fallback

Environment

• Ionic React (PWA)
• Govt-Billing-React/