feat(web): add shadcn/ui base components (Button, Input, ScrollArea)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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

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+import * as React from 'react';
+import { cva, type VariantProps } from 'class-variance-authority';
+import { cn } from '@/lib/utils';
+
+const buttonVariants = cva(
+  'inline-flex items-center justify-center whitespace-nowrap rounded-md text-sm font-medium ring-offset-background transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50',
+  {
+    variants: {
+      variant: {
+        default: 'bg-primary text-primary-foreground hover:bg-primary/90',
+        destructive: 'bg-destructive text-destructive-foreground hover:bg-destructive/90',
+        outline: 'border border-input bg-background hover:bg-accent hover:text-accent-foreground',
+        secondary: 'bg-secondary text-secondary-foreground hover:bg-secondary/80',
+        ghost: 'hover:bg-accent hover:text-accent-foreground',
+        link: 'text-primary underline-offset-4 hover:underline',
+      },
+      size: {
+        default: 'h-10 px-4 py-2',
+        sm: 'h-9 rounded-md px-3',
+        lg: 'h-11 rounded-md px-8',
+        icon: 'h-10 w-10',
+      },
+    },
+    defaultVariants: { variant: 'default', size: 'default' },
+  }
+);
+
+export interface ButtonProps
+  extends React.ButtonHTMLAttributes<HTMLButtonElement>,
+    VariantProps<typeof buttonVariants> {}
+
+const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
+  ({ className, variant, size, ...props }, ref) => (
+    <button className={cn(buttonVariants({ variant, size, className }))} ref={ref} {...props} />
+  )
+);
+Button.displayName = 'Button';
+
+export { Button, buttonVariants };

web/client/src/components/ui/input.tsx

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+import * as React from 'react';
+import { cn } from '@/lib/utils';
+
+export interface InputProps extends React.InputHTMLAttributes<HTMLInputElement> {}
+
+const Input = React.forwardRef<HTMLInputElement, InputProps>(
+  ({ className, type, ...props }, ref) => (
+    <input
+      type={type}
+      className={cn(
+        'flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50',
+        className
+      )}
+      ref={ref}
+      {...props}
+    />
+  )
+);
+Input.displayName = 'Input';
+
+export { Input };

web/client/src/components/ui/scroll-area.tsx

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+'use client';
+
+import * as React from 'react';
+import { cn } from '@/lib/utils';
+
+const ScrollArea = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, children, ...props }, ref) => (
+  <div ref={ref} className={cn('overflow-auto', className)} {...props}>
+    {children}
+  </div>
+));
+ScrollArea.displayName = 'ScrollArea';
+
+export { ScrollArea };

web/components.json

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+{
+  "$schema": "https://ui.shadcn.com/schema.json",
+  "style": "default",
+  "rsc": false,
+  "tsx": true,
+  "tailwind": {
+    "config": "client/tailwind.config.ts",
+    "css": "client/src/index.css",
+    "baseColor": "zinc",
+    "cssVariables": true
+  },
+  "aliases": {
+    "components": "@/components",
+    "utils": "@/lib/utils"
+  }
+}