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2d92214bed
- Add ServicePolicy framework with OSM-specific rate limiting and TTL - Add per-provider disk tile cache (ProviderTileCacheStore) with O(1) lookup, oldest-modified eviction, and ETag/304 revalidation - Rewrite DeflockTileProvider with two paths: common (NetworkTileProvider) and offline-first (disk cache -> local tiles -> network with caching) - Add zoom-aware offline routing so tiles outside offline area zoom ranges use the efficient common path instead of the overhead-heavy offline path - Fix HTTP client lifecycle: dispose() is now a no-op for flutter_map widget recycling; shutdown() handles permanent teardown - Add TileLayerManager with exponential backoff retry (2s->60s cap), provider switch detection, and backoff reset - Guard null provider/tileType in download dialog with localized error - Fix Nominatim cache key to use normalized viewbox values - Comprehensive test coverage (1800+ lines across 6 test files) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>