feat(landing): desktop landing page redesign

- New LandingPageDesktop component with full redesign
- Kurdish flag design tokens, animated sun, ticker band
- Three hero variants (V1 editorial split, V2 terminal, V3 mosaic)
- Live chain data: blocks, validators, nominators, citizens, proposals
- Features grid, architecture section, tokenomics tabs, referral steps
- Pallet grid with SVG sprite icons (16 pallets, 4 pillars)
- Dev-only hero variant switcher (auto-removed in prod)
- Mobile unchanged (MobileHomeLayout), logged-in unchanged

web/src/components/AppLayout.tsx

@@ -2,6 +2,7 @@ import React, { useState, useRef, useEffect } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
 import { useAuth } from '@/contexts/AuthContext';
+import LandingPageDesktop from './landing/LandingPageDesktop';
 import HeroSection from './HeroSection';
 import TokenomicsSection from './TokenomicsSection';
 import PalletsGrid from './PalletsGrid';
@@ -82,6 +83,10 @@ const AppLayout: React.FC = () => {
     return <MobileHomeLayout />;
   }
 
+  if (!user) {
+    return <LandingPageDesktop />;
+  }
+
   return (
     <div className="min-h-screen bg-gray-950 text-white">
       {/* Navigation */}