Copy Button Morph

Build a "Copy Button Morph" React component.

CONCEPT: A copy-to-clipboard button for code snippets that grows from an icon-only square into a labeled pill on success, then shrinks back.

LAYOUT & CONTENT:
- Next to a short monospaced snippet 'npm i framer-motion' in a cream box with a charcoal border.
- Button: 36px square, charcoal border, copy icon. Success state: cobalt fill, cream check that draws in (pathLength), label 'Copied'.

INTERACTIONS & MOTION:
- Use layout on the button so width changes animate with spring stiffness 500 damping 32.
- Icon swap with AnimatePresence mode='popLayout' (scale 0.5 → 1, rotate -30 → 0).
- Return to idle after 1.6s. Call navigator.clipboard.writeText in a try/catch.

DESIGN SYSTEM (non-negotiable):
- Palette: paper background #FAF9F6, deep charcoal #121212 for text and 1px borders, ONE warm accent: cobalt #1D4ED8 or terracotta #D9534F. Secondary surface #F2EFE8.
- Typography: Swiss / editorial. A tight grotesk for UI (Instrument Sans, Inter Tight or similar) with negative tracking on display sizes; an italic serif (Instrument Serif) used sparingly for one emphasized word.
- NO dark-mode neon, NO glow, NO glassmorphism, NO backdrop blur, NO purple-to-blue gradients, NO emoji icons. Solid fills, hairline rules, honest shadows (hard offset or none).
- Motion: Framer Motion with spring physics (type: "spring", stiffness 300-500, damping 20-35). Animate transform and opacity only. Respect prefers-reduced-motion via useReducedMotion().
- Icons: lucide-react, 1.5px stroke.
- Accessibility: real <button>/<a>/<label> elements, visible focus ring (2px cobalt, 3px offset), keyboard operable, aria attributes where state changes.

OUTPUT: one self-contained React component file (Tailwind CSS v4 utility classes, framer-motion, lucide-react), no external images, default export, ready to paste into a Next.js App Router page with "use client".