feat: monochrome black & white rebrand + new Pudu robots

- Convert site from royal-blue theme to black/white monochrome (desaturate
  all blue-hued colors; keep WhatsApp green and error red)
- Swap blue circular brand logo for mono YS mark; regenerate favicon/PWA icons
- Add 6 Pudu robots (CC1 Pro, MT1 Max, MT1 Vac, T600, T600 Underride, BG1 Pro)
- Fix favicon.ico to RGBA (Next 16 Turbopack decode) and Stripe apiVersion type

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app/about/page.tsx

@@ -26,7 +26,7 @@ export default function AboutPage() {
             <h1 style={{ margin: 0, fontSize: 'clamp(2rem, 5vw, 3.4rem)', fontWeight: 300, lineHeight: 1.05, letterSpacing: '-0.03em' }}>
               <span className="text-gradient" style={{ fontWeight: 500 }}>In Tech We Innovate. In Trust We Lead.</span>
             </h1>
-            <p style={{ margin: 0, color: '#DEE0F0', fontSize: 'clamp(0.95rem, 2vw, 1.05rem)', lineHeight: 1.7 }}>
+            <p style={{ margin: 0, color: '#e7e7e7', fontSize: 'clamp(0.95rem, 2vw, 1.05rem)', lineHeight: 1.7 }}>
               YS Lootah Robotics is part of the Yousuf Saeed Lootah Investment Group a trusted UAE technology and robotics partner helping businesses innovate, automate, and deploy intelligent robotic solutions. The UAE&apos;s dedicated destination for selected Unitree and Pudu Robotics solutions.
             </p>
           </div>