chore: latest dev tooling, corepack

[ibgreen]

Prep diff for TypeScript 6 introduction

Summary

This PR updates math.gl's local tooling and CI setup to match the newer luma.gl pattern.

What changed

• Migrated from Volta to Corepack
• Switched the default Node environment to Node 22
• Pinned Yarn via packageManager and .nvmrc
• Upgraded @vis.gl/dev-tools and @vis.gl/ts-plugins to ^1.0.2
• Updated GitHub Actions workflows to use actions/setup-node + Corepack instead of volta-cli/action
• Added bare @math.gl/* TS path aliases so workspace package imports resolve correctly during linting

Notable details

• Added .nvmrc with 22.22.1
• Set root packageManager to yarn@4.13.0
• Removed stale Volta config from the root package and website package
• Updated CI caching/install steps to use Yarn 4/Corepack conventions
• Refreshed lockfiles after the dependency/tooling updates

Why

• Align math.gl with the tooling and CI approach already adopted in luma.gl
• Make Node 22 the default test/runtime environment
• Remove the repo’s dependency on Volta
• Bring dev tooling up to date
• Fix lint-time resolution for bare workspace imports such as @math.gl/culling

Validation

• yarn install
• yarn build
• yarn test
• yarn lint

All of the above pass after this change.

[chatgpt-codex-connector]

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[chrisgervang]

👍

[chrisgervang]

What does prepare do? That's a new one to me