Deliverra polished final build

Updates included:
- Scroll-following curved route logic
- Vehicles rotate to face travel direction
- SVG-style scooter, car and bicycle assets
- Parallax city/suburb scenery
- Animated delivery dots along the route
- Vehicle hover glow
- Rich driver app mockup with live shift, map, pay and payout details

Main files:
- index.html
- styles.css
- script.js
