Remove some unneeded code

frontend/src/components/ui/alert.tsx

@@ -1,50 +0,0 @@
-import * as React from 'react';
-import { cva, type VariantProps } from 'class-variance-authority';
-
-import { cn } from '@/lib/utils';
-
-const alertVariants = cva(
-  'relative w-full rounded-lg border p-4 [&>svg~*]:pl-7 [&>svg+div]:translate-y-[-3px] [&>svg]:absolute [&>svg]:left-4 [&>svg]:top-4 [&>svg]:text-foreground',
-  {
-    variants: {
-      variant: {
-        default: 'bg-background text-foreground',
-        destructive:
-          'border-destructive/50 text-destructive dark:border-destructive [&>svg]:text-destructive',
-        warning: 'border-yellow-500/50 bg-yellow-500/10 text-yellow-200 [&>svg]:text-yellow-500',
-      },
-    },
-    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';
-
-export { Alert, AlertTitle, AlertDescription };