Build a neon synthwave endless highway racer in the browser (Three.js, single HTML page, no external assets). You drive a glowing retro sports car down an infinite grid road toward a giant striped sunset, weaving through traffic with arrow keys, with speed lines, bloom, a pulsing synth soundtrack generated in code, near-miss bonuses and a crash that shatters into polygons. It should feel fast and fun the moment it loads.