Add new Frontend

frontend/src/components/ui/Button.tsx

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+// 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;

frontend/src/components/ui/Card.tsx

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+// src/components/ui/Card.tsx
+import React from 'react';
+import { clsx } from 'clsx';
+
+interface CardProps {
+  children: React.ReactNode;
+  className?: string;
+  padding?: 'none' | 'sm' | 'md' | 'lg';
+}
+
+const Card: React.FC<CardProps> = ({ 
+  children, 
+  className, 
+  padding = 'md' 
+}) => {
+  const paddingClasses = {
+    none: '',
+    sm: 'p-4',
+    md: 'p-6',
+    lg: 'p-8'
+  };
+
+  return (
+    <div className={clsx(
+      'bg-white rounded-xl shadow-soft',
+      paddingClasses[padding],
+      className
+    )}>
+      {children}
+    </div>
+  );
+};
+
+export default Card;

frontend/src/components/ui/Input.tsx

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+// src/components/ui/Input.tsx
+import React from 'react';
+import { clsx } from 'clsx';
+
+interface InputProps extends React.InputHTMLAttributes<HTMLInputElement> {
+  label?: string;
+  error?: string;
+  helperText?: string;
+}
+
+const Input: React.FC<InputProps> = ({
+  label,
+  error,
+  helperText,
+  className,
+  id,
+  ...props
+}) => {
+  const inputId = id || `input-${Math.random().toString(36).substr(2, 9)}`;
+
+  return (
+    <div className="w-full">
+      {label && (
+        <label
+          htmlFor={inputId}
+          className="block text-sm font-medium text-gray-700 mb-2"
+        >
+          {label}
+        </label>
+      )}
+      <input
+        id={inputId}
+        className={clsx(
+          'w-full px-4 py-3 border rounded-xl transition-all duration-200',
+          'placeholder-gray-400 text-gray-900',
+          'focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-primary-500',
+          error
+            ? 'border-red-300 bg-red-50'
+            : 'border-gray-300 hover:border-gray-400',
+          className
+        )}
+        {...props}
+      />
+      {error && (
+        <p className="mt-1 text-sm text-red-600">{error}</p>
+      )}
+      {helperText && !error && (
+        <p className="mt-1 text-sm text-gray-500">{helperText}</p>
+      )}
+    </div>
+  );
+};
+
+export default Input;

frontend/src/components/ui/LoadingSpinner.tsx

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+// src/components/ui/LoadingSpinner.tsx
+import React from 'react';
+import { Loader2 } from 'lucide-react';
+
+interface LoadingSpinnerProps {
+  size?: 'sm' | 'md' | 'lg';
+  className?: string;
+}
+
+const LoadingSpinner: React.FC<LoadingSpinnerProps> = ({ 
+  size = 'md', 
+  className = '' 
+}) => {
+  const sizeClasses = {
+    sm: 'h-4 w-4',
+    md: 'h-6 w-6',
+    lg: 'h-8 w-8'
+  };
+
+  return (
+    <Loader2 
+      className={`animate-spin text-primary-500 ${sizeClasses[size]} ${className}`} 
+    />
+  );
+};
+
+export default LoadingSpinner;