Text Loop

# Animation pattern — Text Loop

Text animation that transitions between multiple items, creating an engaging looping effect.

Build it in React with `motion` (motion/react) and Tailwind CSS. Respect `prefers-reduced-motion` (render the final state without movement), keep it under ~400 ms for UI feedback, and animate only transform and opacity where possible.

Reference implementation (Motion-Primitives, MIT):

```tsx
'use client';
import { cn } from '@/lib/utils';
import {
  motion,
  AnimatePresence,
  Transition,
  Variants,
  AnimatePresenceProps,
} from 'motion/react';
import { useState, useEffect, Children } from 'react';

export type TextLoopProps = {
  children: React.ReactNode[];
  className?: string;
  interval?: number;
  transition?: Transition;
  variants?: Variants;
  onIndexChange?: (index: number) => void;
  trigger?: boolean;
  mode?: AnimatePresenceProps['mode'];
};

export function TextLoop({
  children,
  className,
  interval = 2,
  transition = { duration: 0.3 },
  variants,
  onIndexChange,
  trigger = true,
  mode = 'popLayout',
}: TextLoopProps) {
  const [currentIndex, setCurrentIndex] = useState(0);
  const items = Children.toArray(children);

  useEffect(() => {
    if (!trigger) return;

    const intervalMs = interval * 1000;
    const timer = setInterval(() => {
      setCurrentIndex((current) => {
        const next = (current + 1) % items.length;
        onIndexChange?.(next);
        return next;
      });
    }, intervalMs);
    return () => clearInterval(timer);
  }, [items.length, interval, onIndexChange, trigger]);

  const motionVariants: Variants = {
    initial: { y: 20, opacity: 0 },
    animate: { y: 0, opacity: 1 },
    exit: { y: -20, opacity: 0 },
  };

  return (
    <div className={cn('relative inline-block whitespace-nowrap', className)}>
      <AnimatePresence mode={mode} initial={false}>
        <motion.div
          key={currentIndex}
          initial='initial'
          animate='animate'
          exit='exit'
          transition={transition}
          variants={variants || motionVariants}
        >
          {items[currentIndex]}
        </motion.div>
      </AnimatePresence>
    </div>
  );
}
```