feat: Implement responsive design for the experiment designer and enhance general UI components with hover effects and shadows.

src/components/ui/table.tsx

@@ -18,7 +18,7 @@ function TableHeader({ className, ...props }: React.ComponentProps<"thead">) {
   return (
     <thead
       data-slot="table-header"
-      className={cn("[&_tr]:border-b", className)}
+      className={cn("[&_tr]:border-b bg-secondary/30", className)}
       {...props}
     />
   );