Fix heading structure (H1-H6) and button layouts, add noindex to cart and order pages

components/ui/Button.tsx

@@ -0,0 +1,54 @@
+import React from 'react';
+import { cn } from '@/lib/utils';
+
+export type ButtonVariant = 'primary' | 'outline' | 'error';
+export type ButtonSize = 'sm' | 'md' | 'lg';
+
+export interface ButtonClassesProps {
+  variant?: ButtonVariant;
+  size?: ButtonSize;
+  className?: string;
+}
+
+export function buttonClasses({ variant = 'primary', size = 'md', className }: ButtonClassesProps = {}) {
+  const baseClasses = 'inline-flex items-center justify-center gap-2 whitespace-nowrap transition-colors';
+  
+  const variantClasses = {
+    primary: 'btn btn-primary text-white font-bold',
+    outline: 'btn bg-white/10 text-white border border-white/20 hover:bg-white/20 font-bold',
+    error: 'btn btn-error text-white font-bold',
+  };
+  
+  const sizeClasses = {
+    sm: 'btn-sm text-sm',
+    md: '', // default DaisyUI btn size
+    lg: 'btn-lg text-lg',
+  };
+
+  return cn(
+    baseClasses,
+    variantClasses[variant],
+    sizeClasses[size],
+    className
+  );
+}
+
+export interface ButtonProps extends React.ButtonHTMLAttributes<HTMLButtonElement>, ButtonClassesProps {
+  children: React.ReactNode;
+}
+
+export const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
+  ({ className, variant, size, children, ...props }, ref) => {
+    return (
+      <button
+        ref={ref}
+        className={buttonClasses({ variant, size, className })}
+        {...props}
+      >
+        {children}
+      </button>
+    );
+  }
+);
+
+Button.displayName = 'Button';