redesign landing page with the new design language
the landing page now ships with the full design system: tighter typography, real brand logos in the "works inside" pill row (claude, chatgpt, codex, cursor, claude code, windsurf, any terminal), real testimonial photos for gs thina and hameed raha, an infinite marquee for social proof, a 7-column footer with real product links, a black final cta section with the install command pill, and a mobile burger menu. fully responsive across mobile, tablet, and desktop.