Font: Noto Naskh Arabic (Bold)
Source: Google Noto Fonts project — https://fonts.google.com/noto/specimen/Noto+Naskh+Arabic
License: SIL Open Font License, Version 1.1 — https://openfontlicense.org

Bundled here so QR-code label rendering (Arabic + Latin, correctly joined
and shaped) does not depend on fonts being present on the host OS — the
previous implementation referenced macOS-only system font paths, which
don't exist on the Linux production server and caused generate-qr to
fail with a 500 error.
