Fixes a real race in FileTileCache where two overlapping put() calls
(the persistent background map and a freshly-opened Route Planner map
both fetching tiles at once) could interleave at the _saveManifest
await point and silently lose a tile from the on-disk manifest. All
mutating and reading operations now go through a single serialization
queue. Also logs the URL and cause of tile fetch failures in
CachedTileProvider before rethrowing, and adds a concurrency
regression test. On-device verification was not performed (no
adb/emulator access in this environment); see the ticket's Outcome
section.
Replaces OSM's tan/cream default raster style with CARTO's "Dark Matter"
basemap (both RideMap and the route planner's independent TileLayer), so
the map itself looks like the dark mockups rather than a light basemap
under a dark overlay. Shares one urlTemplate/subdomains/maxNativeZoom
across both call sites instead of two independently-drifting copies.
Re-points the V3-11 tile cache at a versioned directory (tiles/carto_dark_v1)
since TileKey(z, x, y) carries no provider identity and would otherwise
silently serve stale tan tiles cached under the old scheme. Added a test
proving cache isolation holds across provider directories.
Adds a shared TileAttribution widget crediting both OpenStreetMap (CARTO's
style is still built from OSM data) and CARTO, composed into every map
rather than duplicated per screen -- OSM-only credit stopped being
sufficient once a second tile host entered the mix.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012Xki7YAcc2TiN2PRZJ2tXr
Three pure modules: tile_math.dart (tilesForBounds/tilesAlongRoute, hard cap enforced by throwing), tile_cache.dart (FileTileCache with LRU eviction before any write that would exceed the cap), tile_downloader.dart (sequential, rate-limited, cooperatively cancellable, one bad tile doesn't abort the rest). CachedTileProvider wires the cache into flutter_map via a custom ImageProvider and now backs RideMap and RoutePlannerScreen's tile layers, so ordinary viewing write-throughs into the same capped cache.
RoutePlannerScreen gained a route-corridor download action (no rectangle-selection UI -- the ticket names the corridor as strictly better and V3-07 already exists to hang it off of), with a count/size confirmation before any request and a cancellable progress dialog. Fixed a real bug before shipping: a StatefulBuilder-based progress dialog would have started a new overlapping download subscription on every single progress tick; moved to a dedicated StatefulWidget that subscribes once in initState.
Marked partially done: aeroplane-mode verification on a real device is the ticket's own acceptance criterion and needs a phone this environment doesn't have.
