feat: update navigation scroll-spy grouping, fix active links under Lenis scroll, and update footer categories

src/components/layout/Footer.tsx

@@ -20,16 +20,16 @@ const NAV = [
     ],
   },
   {
-    title: 'Platform',
+    title: 'Spend',
     color: '#FF2E88', // pink
     links: [
-      { label: 'Why Now', href: '#why-now' },
+      { label: 'The Difference', href: '#difference' },
       { label: 'How It Works', href: '#how-it-works' },
       { label: 'The Loop', href: '#the-loop' },
     ],
   },
   {
-    title: 'Company',
+    title: 'Live',
     color: '#8B3DFF', // purple
     links: [
       { label: 'The Vision', href: '#the-vision' },