refactor: standardize vertical spacing across feature sections

- Reduced py-10 to py-8 for consistent spacing in feature grids and carousels
- Restructured HomeHosting and HomeTab sections with full-width border layout pattern
- Replaced HomeTab card grid with bento-style component showcase layout

src/components/features-section-demo-3.tsx

@@ -40,7 +40,7 @@ export default function FeaturesSectionDemo() {
     },
   ];
   return (
-    <div className="relative z-20 py-10 lg:py-40 max-w-7xl mx-auto">
+    <div className="relative z-20 py-8 lg:py-40 max-w-7xl mx-auto">
       <div className="px-8">
         <h4 className="text-3xl lg:text-5xl lg:leading-tight max-w-5xl mx-auto text-center tracking-tight font-medium text-black dark:text-white">
           Packed with thousands of features