American Palette

Patch Notes Summary: NEW FEATURE! Progress bar showing how much of the U.S. you've discovered. TL;DR: Massively improved performance, increasingly responsive interface, much less stuttering. Performance Improvements Single Overlay Rendering System - Replaced 3,143 individual polygon overlays with one unified overlay renderer - Border toggle is now 5-10x faster (from 1-2 seconds to 0.1-0.2 seconds) - Smoother map panning and zooming - Reduced memory footprint by ~60-80% Removed 30-Second Pulse Timer - Eliminated unnecessary background location pings when zoomed in - Reduced battery drain - Simplified location tracking logic Thread Safety & Crash Prevention - Added `dictionaryQueue` serial queue to protect all dictionary access - Fixed 16+ locations where `visitedOrderByGeoID` and `visitedColorByGeoID` were accessed unsafely Critical fixes: - Location updates (background thread) - prevented race conditions during driving - Core Data restore/import (background thread) - prevented data corruption - County marking operations - prevented concurrent modification crashes Gesture Handler Optimization - Moved heavy polygon hit-testing off main thread - Tap and long-press gestures are now instant and responsive - Fixed UI freezing when interacting with map Bug Fixes - Fixed `refreshCountyOverlays` reference after method removal - Fixed `AllCountiesRenderer` overlay property shadowing compiler error - Fixed `rendererCache` usage in `polygonContainsFast` after cache removal - Fixed county removal calling deleted `refreshCountyOverlays` method UI/UX Changes - County borders now enabled by default (can still toggle off) - All dictionary access in gesture handlers is now non-blocking - Smoother interaction during map manipulation