Refactor code structure for improved readability and maintainability

frontend/src/components/ui/alert.tsx

@@ -0,0 +1,69 @@
+import * as React from 'react';
+import { cva, type VariantProps } from 'class-variance-authority';
+import { AlertTriangle, CheckCircle, Info, XCircle } from 'lucide-react';
+
+import { cn } from '@/lib/utils';
+
+const alertVariants = cva(
+  'relative w-full rounded-lg border p-4 [&>svg]:absolute [&>svg]:-top-1 [&>svg]:-left-1 [&>svg]:h-4 [&>svg]:w-4 [&>svg]:text-foreground',
+  {
+    variants: {
+      variant: {
+        default: 'bg-background text-foreground border',
+        destructive:
+          'border-destructive/50 text-destructive dark:border-destructive [&>svg]:text-destructive',
+        success: 'border-green-500/50 text-green-700 dark:border-green-500 [&>svg]:text-green-700',
+        warning:
+          'border-yellow-500/50 text-yellow-700 dark:border-yellow-500 [&>svg]:text-yellow-700',
+        info: 'border-blue-500/50 text-blue-700 dark:border-blue-500 [&>svg]:text-blue-700',
+      },
+    },
+    defaultVariants: {
+      variant: 'default',
+    },
+  }
+);
+
+const Alert = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement> & VariantProps<typeof alertVariants>
+>(({ className, variant, ...props }, ref) => (
+  <div ref={ref} role="alert" className={cn(alertVariants({ variant }), className)} {...props} />
+));
+Alert.displayName = 'Alert';
+
+const AlertTitle = React.forwardRef<HTMLParagraphElement, React.HTMLAttributes<HTMLHeadingElement>>(
+  ({ className, ...props }, ref) => (
+    <h5
+      ref={ref}
+      className={cn('mb-1 font-medium leading-none tracking-tight', className)}
+      {...props}
+    />
+  )
+);
+AlertTitle.displayName = 'AlertTitle';
+
+const AlertDescription = React.forwardRef<
+  HTMLParagraphElement,
+  React.HTMLAttributes<HTMLParagraphElement>
+>(({ className, ...props }, ref) => (
+  <div ref={ref} className={cn('text-sm [&_p]:leading-relaxed', className)} {...props} />
+));
+AlertDescription.displayName = 'AlertDescription';
+
+const AlertIcon = ({ variant }: { variant?: VariantProps<typeof alertVariants>['variant'] }) => {
+  switch (variant) {
+    case 'destructive':
+      return <XCircle className="h-4 w-4" />;
+    case 'success':
+      return <CheckCircle className="h-4 w-4" />;
+    case 'warning':
+      return <AlertTriangle className="h-4 w-4" />;
+    case 'info':
+      return <Info className="h-4 w-4" />;
+    default:
+      return <Info className="h-4 w-4" />;
+  }
+};
+
+export { Alert, AlertTitle, AlertDescription, AlertIcon };