Add 'use client' directive for RSC compatibility

[Copilot]

Marks the Mcu component as a client component for React Server Components frameworks.

Changes

• src/Mcu.tsx: Added "use client" directive at top of file
• tsup.config.ts: Added banner config to preserve directive in bundled output
• .changeset: Created patch changeset via pnpm changeset

The Mcu component uses hooks and DOM manipulation (style tag injection), requiring client-side execution. This aligns with Mcu.context.tsx which already had the directive.

// dist/index.js output now includes:
"use client";

// src/Mcu.tsx
import { ... } from "@material/material-color-utilities";

Original prompt

add 'use client' directive in Mcu.tsx

run pnpm changeset as a patch

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.