v2.3.0

Offline

• Added a complete offline mode for fare calculation and route planning.
• Implemented automatic tile caching and local geocoding cache support.
• Added an offline map picker with coordinate-based selection.

Routing

• Added a four-level routing fallback: OSRM, cache, graph, then Haversine.
• Added accuracy indicators for precise, estimated, and approximate results.
• Added connectivity-aware status banners and cross-region warnings.

Quality

• Added integration, performance, and unit coverage for the offline workflow.
• Improved null handling and consistency across offline fare results.