Add new Frontend

frontend/src/components/ui/Button.tsx

@@ -0,0 +1,57 @@
+// src/components/ui/Button.tsx
+import React from 'react';
+import { clsx } from 'clsx';
+import LoadingSpinner from './LoadingSpinner';
+
+interface ButtonProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
+  variant?: 'primary' | 'secondary' | 'outline' | 'danger';
+  size?: 'sm' | 'md' | 'lg';
+  isLoading?: boolean;
+  children: React.ReactNode;
+}
+
+const Button: React.FC<ButtonProps> = ({
+  variant = 'primary',
+  size = 'md',
+  isLoading = false,
+  className,
+  children,
+  disabled,
+  ...props
+}) => {
+  const baseClasses = 'inline-flex items-center justify-center font-medium rounded-xl transition-all duration-200 focus:outline-none focus:ring-2 focus:ring-offset-2';
+  
+  const variantClasses = {
+    primary: 'bg-primary-500 text-white hover:bg-primary-600 focus:ring-primary-500 shadow-soft hover:shadow-medium',
+    secondary: 'bg-gray-500 text-white hover:bg-gray-600 focus:ring-gray-500 shadow-soft hover:shadow-medium',
+    outline: 'border border-gray-300 text-gray-700 hover:bg-gray-50 focus:ring-primary-500',
+    danger: 'bg-red-500 text-white hover:bg-red-600 focus:ring-red-500 shadow-soft hover:shadow-medium',
+  };
+
+  const sizeClasses = {
+    sm: 'px-3 py-1.5 text-sm',
+    md: 'px-4 py-2.5 text-sm',
+    lg: 'px-6 py-3 text-base',
+  };
+
+  const isDisabled = disabled || isLoading;
+
+  return (
+    <button
+      className={clsx(
+        baseClasses,
+        variantClasses[variant],
+        sizeClasses[size],
+        isDisabled && 'opacity-50 cursor-not-allowed',
+        className
+      )}
+      disabled={isDisabled}
+      {...props}
+    >
+      {isLoading && <LoadingSpinner size="sm" className="mr-2" />}
+      {children}
+    </button>
+  );
+};
+
+export default Button;