feat: add pause()/resume() to UndoManager - #1053

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v3, actions/setup-node@v4, denoland/setup-deno@v1, jetli/wasm-bindgen-action@v0.2.0, jetli/wasm-pack-action@v0.4.0, oven-sh/setup-bun@v1, pnpm/action-setup@v4, taiki-e/install-action@v1. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Failed to save: <h2>Our services aren't available right now</h2><p>We're working to restore all services as soon as possible. Please check back soon.</p>02lJtagAAAAD8sAEkuKxJQYubcKjERZG3TEFYMzExMDAwMTA4MDE5AEVkZ2U=