Minimal UX pass: cut action clutter, more breathing room

- VideoCard: actions now hover-only everywhere (was always-visible on mobile)
- Watch: remove Good/Bad rating chips — Like covers positive signal,
  dismiss/skip covers negative. Fewer buttons, same data.
- Watch: PiP and Theater are now icon-only (no label)
- Watch: increase content gap to gap-4/gap-5 for more breathing room

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/VideoCard.jsx

@@ -318,8 +318,8 @@ export default function VideoCard({ video, size = "md", onDismiss, variant = "gr
             </p>
           )}
 
-          {/* Actions — always visible on mobile, fade on desktop */}
-          <div className="mt-auto pt-1 sm:opacity-0 sm:pointer-events-none sm:group-hover:opacity-100 sm:group-hover:pointer-events-auto sm:transition-opacity sm:duration-150">
+          {/* Actions — hover only everywhere */}
+          <div className="mt-auto pt-1 opacity-0 pointer-events-none group-hover:opacity-100 group-hover:pointer-events-auto transition-opacity duration-150">
             {actions}
           </div>
         </div>