Adjust spacing for video categories on the homepage

Update CSS class in `netflix-grid.tsx` to reduce top margin for category rows.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 074b0e4c-6171-43bd-aa98-f9e04623ca14
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/8cc42625-c1f5-4e43-99bd-77f2c4dedee2/074b0e4c-6171-43bd-aa98-f9e04623ca14/iazasnP

client/src/components/netflix-grid.tsx

@@ -107,7 +107,7 @@ export default function NetflixGrid({ videos, isLoading }: NetflixGridProps) {
     <>
       <div>
         {categories.map((category, categoryIndex) => (
-          <div key={categoryIndex} className={`mb-6 ${categoryIndex === 0 ? 'mt-4' : ''}`}>
+          <div key={categoryIndex} className={`mb-6 ${categoryIndex === 0 ? 'mt-2' : ''}`}>
             <CategoryRow
               category={category}
               onVideoClick={handleVideoClick}