Add React web scaffold

apps/web/src/components/ui/button.tsx

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+import { Slot } from '@radix-ui/react-slot';
+import { cva, type VariantProps } from 'class-variance-authority';
+import type { ButtonHTMLAttributes } from 'react';
+import { cn } from '@/lib/utils';
+
+const buttonVariants = cva(
+  'inline-flex items-center justify-center rounded-md text-sm font-medium transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary disabled:pointer-events-none disabled:opacity-50',
+  {
+    variants: {
+      variant: {
+        default: 'bg-primary text-primary-foreground hover:bg-primary/90',
+        outline: 'border border-border bg-transparent hover:bg-muted',
+        ghost: 'hover:bg-muted',
+      },
+      size: {
+        default: 'h-10 px-4 py-2',
+        lg: 'h-12 rounded-lg px-6',
+      },
+    },
+    defaultVariants: {
+      variant: 'default',
+      size: 'default',
+    },
+  },
+);
+
+type ButtonProps = ButtonHTMLAttributes<HTMLButtonElement> &
+  VariantProps<typeof buttonVariants> & {
+    asChild?: boolean;
+  };
+
+export function Button({ className, variant, size, asChild = false, ...props }: ButtonProps) {
+  const Comp = asChild ? Slot : 'button';
+
+  return <Comp className={cn(buttonVariants({ variant, size, className }))} {...props} />;
+}

apps/web/src/components/ui/card.tsx

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+import type { HTMLAttributes } from 'react';
+import { cn } from '@/lib/utils';
+
+export function Card({ className, ...props }: HTMLAttributes<HTMLDivElement>) {
+  return <div className={cn('rounded-lg border bg-card text-card-foreground shadow-sm', className)} {...props} />;
+}
+
+export function CardHeader({ className, ...props }: HTMLAttributes<HTMLDivElement>) {
+  return <div className={cn('flex flex-col space-y-1.5 p-6', className)} {...props} />;
+}
+
+export function CardTitle({ className, ...props }: HTMLAttributes<HTMLHeadingElement>) {
+  return <h3 className={cn('text-2xl font-semibold leading-none tracking-tight', className)} {...props} />;
+}
+
+export function CardDescription({ className, ...props }: HTMLAttributes<HTMLParagraphElement>) {
+  return <p className={cn('text-sm text-muted-foreground', className)} {...props} />;
+}
+
+export function CardContent({ className, ...props }: HTMLAttributes<HTMLDivElement>) {
+  return <div className={cn('p-6 pt-0', className)} {...props} />;
+}