Overpass and Overpass Mono are licensed under the SIL Open Font License,
Version 1.1: https://openfontlicense.org/

Fetched from Google Fonts (fonts.google.com/specimen/Overpass,
fonts.google.com/specimen/Overpass+Mono) and self-hosted here rather than
loaded from a CDN, so the app has no runtime dependency on Google's font
service.