New Progress area, global stats, and faster route data

Highlights

• Added a new Progress area with current progress, weekly progress, records, achievements, total stats, and next mission.
• Added global statistics for walked streets, distance, steps, and progress across cities.
• Moved heavy route and map data to Core Data with migration support.

This update makes progress, routes, and street stats clearer, faster, and easier to trust across different cities.

What changed in Streets 4.7.24

• Added a new Progress area with current progress, weekly progress, records, achievements, total stats, and next mission.
• Added global statistics for walked streets, distance, steps, and progress across cities.
• Fixed cases where progress worked in one city but appeared broken in another.
• Improved Total Stats and fixed mismatches between stats and explored streets.
• Moved heavy route, planned route, and favorite place data from UserDefaults to Core Data.
• Added proper Core Data migration support for safer updates.
• Added thinner route lines.
• Improved map loading.
• Removed the gray map overlay.