GeoJSON is a popular geospatial data interchange format, standardised as [RFC 7946](https://datatracker.ietf.org/doc/html/rfc7946). Because all GeoJSON files are valid JSON files, they can be highlighted using Zed's existing JSON language support. This change adds `geojson` as a recognised path suffix, so GeoJSON files automatically open as JSON and get the standard JSON syntax highlighting. Before and after screenshots: <img width="1748" height="755" alt="geojson" src="https://github.com/user-attachments/assets/40199248-1ce5-451e-9200-5b2f012b865f" /> Release notes: - Added automatic syntax highlighting for GeoJSON files