Refactor code structure for improved readability and maintainability

frontend/src/components/ui/checkbox.tsx

@@ -0,0 +1,26 @@
+import * as React from 'react';
+import * as CheckboxPrimitive from '@radix-ui/react-checkbox';
+import { Check } from 'lucide-react';
+
+import { cn } from '@/lib/utils';
+
+const Checkbox = React.forwardRef<
+  React.ElementRef<typeof CheckboxPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof CheckboxPrimitive.Root>
+>(({ className, ...props }, ref) => (
+  <CheckboxPrimitive.Root
+    ref={ref}
+    className={cn(
+      'peer h-4 w-4 shrink-0 rounded-sm border border-primary ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 data-[state=checked]:bg-primary data-[state=checked]:text-primary-foreground',
+      className
+    )}
+    {...props}
+  >
+    <CheckboxPrimitive.Indicator className={cn('flex items-center justify-center text-current')}>
+      <Check className="h-4 w-4" />
+    </CheckboxPrimitive.Indicator>
+  </CheckboxPrimitive.Root>
+));
+Checkbox.displayName = CheckboxPrimitive.Root.displayName;
+
+export { Checkbox };