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Maurice
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In a browser the service worker answers MapLibre from the gl-map-offline cache that glPrefetcher fills for trips marked for offline. The iOS app has no service worker, so nothing read that cache there and the map went blank without network. A trek-offline:// protocol takes the service worker's place. Inside the iOS app the MapLibre style URL is rewritten to it, the handler rewrites every https URL inside the style and its TileJSON the same way, and then serves documents network first and tiles, glyphs and sprites cache first. Outside the iOS app nothing changes. The default OpenFreeMap basemap is covered; Mapbox GL has no protocol hook and stays online-only in the app, as does a custom raster template, whose opaque responses only a service worker can store.