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feat: map download with resume, update checking, and integrity verification - #101
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- Resume partial downloads via HTTP Range headers (survives app restarts) - Check for map updates on NavigationSetupScreen open (digest comparison) - SHA256 integrity verification against GitHub release digests - Byte-weighted progress with MB display across display + valhalla tiles - Disk space check before download - Track installed map metadata in metadata.json - Fix valhalla: use tar directly (no extraction), correct service name - Remove nonexistent mbtileserver restart
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Adds map downloading to the navigation setup screen. When maps are missing or outdated, the user can download display tiles and Valhalla routing tiles for their current region. The region is resolved from the current GPS position via Nominatim reverse geocoding.
Downloads are resumable: files are written with a
.partsuffix and HTTP Range requests are used to continue interrupted transfers. Each file is verified with SHA256 against the digest published in the GitHub release. Installed region, digests, and timestamps are persisted inmetadata.json(viaMapMetadata), which is checked on screen open to detect available updates. A progress bar tracks total bytes across both tile types, and available disk space is checked before starting.Test plan