Add Tailwind v4 and shadcn/ui baseline components

frontend/src/components/ui/card.tsx

@@ -0,0 +1,46 @@
+import * as React from 'react'
+import { cn } from '@/lib/utils'
+
+export const Card = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => (
+    <div
+      ref={ref}
+      className={cn('rounded-lg border bg-card text-card-foreground shadow-sm overflow-hidden', className)}
+      {...props}
+    />
+  ),
+)
+Card.displayName = 'Card'
+
+export const CardHeader = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => (
+    <div ref={ref} className={cn('flex flex-col space-y-1.5 p-6', className)} {...props} />
+  ),
+)
+CardHeader.displayName = 'CardHeader'
+
+export const CardTitle = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => (
+    <div ref={ref} className={cn('font-semibold leading-none tracking-tight', className)} {...props} />
+  ),
+)
+CardTitle.displayName = 'CardTitle'
+
+export const CardDescription = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => (
+    <div ref={ref} className={cn('text-sm text-muted-foreground', className)} {...props} />
+  ),
+)
+CardDescription.displayName = 'CardDescription'
+
+export const CardContent = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => <div ref={ref} className={cn('p-6 pt-0', className)} {...props} />,
+)
+CardContent.displayName = 'CardContent'
+
+export const CardFooter = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => (
+    <div ref={ref} className={cn('flex items-center p-6 pt-0', className)} {...props} />
+  ),
+)
+CardFooter.displayName = 'CardFooter'