feat: flashy mobile bottom nav with per-route colored bubbles

fix: local time, 0-qty guard, mobile card fields, glass UI

fix: mobile-friendly reports and transactions views; remove How It Works from nav

feat: add How It Works page explaining all three agent flows

fix: lift mobile bottom nav clear of screen corners and home indicator

feat: mobile-first responsive layout

Add GitHub Actions CI/CD, HF Space deployment, market hours guard, and static serving