fix: add missing Button UI component for daarion-web build

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

@@ -0,0 +1,48 @@
+'use client';
+
+import * as React from 'react';
+
+export interface ButtonProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
+  variant?: 'default' | 'outline' | 'ghost' | 'link' | 'destructive';
+  size?: 'default' | 'sm' | 'lg' | 'icon';
+  asChild?: boolean;
+}
+
+const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
+  ({ className = '', variant = 'default', size = 'default', children, disabled, ...props }, ref) => {
+    const baseStyles = 'inline-flex items-center justify-center whitespace-nowrap rounded-md font-medium transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50';
+    
+    const variantStyles = {
+      default: 'bg-blue-600 text-white hover:bg-blue-700',
+      outline: 'border border-gray-600 bg-transparent hover:bg-gray-800 text-gray-200',
+      ghost: 'hover:bg-gray-800 text-gray-200',
+      link: 'text-blue-400 underline-offset-4 hover:underline',
+      destructive: 'bg-red-600 text-white hover:bg-red-700',
+    };
+
+    const sizeStyles = {
+      default: 'h-10 px-4 py-2 text-sm',
+      sm: 'h-8 px-3 text-xs',
+      lg: 'h-12 px-6 text-base',
+      icon: 'h-10 w-10',
+    };
+
+    const combinedClassName = `${baseStyles} ${variantStyles[variant]} ${sizeStyles[size]} ${className}`;
+
+    return (
+      <button
+        ref={ref}
+        className={combinedClassName}
+        disabled={disabled}
+        {...props}
+      >
+        {children}
+      </button>
+    );
+  }
+);
+
+Button.displayName = 'Button';
+
+export { Button };
+