Update `netflix-grid.tsx` to modify CSS classes for category rows and video cards, adjusting margins, padding, and widths for improved visual presentation.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 8e9f2b36-ec9c-4acc-b19b-5304fa9790c5
Replit-Commit-Checkpoint-Type: full_checkpoint
