Jj Mobile Performance Optimization

@dmccarty30/journeyman-jobs-mobile-performance-optimization

Optimize Flutter app performance for 8-12 hour electrical field worker shifts. Targets battery efficiency (<15%/hr active), 60fps scrolling, memory management (<150MB), cold start (<2s), network resilience, and offline performance. Use when app feels sluggish, battery drains fast, memory grows, or testing on low-end devices.