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TileDownloader fetches OSM raster tiles over HTTPS when not found on SD card, saves them for permanent offline cache. MapScreen calls ensure_tile() before each LVGL load — tiles download once, then load from SD on subsequent views. Default tile server: tile.openstreetmap.org (configurable via set_tile_url). Proper User-Agent set per OSM usage policy. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>