chore: add Node/React matrix CI

[kotAPI]

Summary

• run tests on Node 18 and 20
• install React 18 and 19 in matrix with dedupe

Testing

• npm test

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https://chatgpt.com/codex/tasks/task_e_68bcfd90ef6c833182d79577eef740c1

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📥 Commits

Reviewing files that changed from the base of the PR and between 260b49d and e964e93.

📒 Files selected for processing (1)

• .github/workflows/ci.yml (1 hunks)

✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch kotapi/add-github-actions-matrix-for-node-and-react

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[chatgpt-codex-connector]

[P1] Remove nonexistent React 19 from test matrix

The workflow introduces a matrix entry react-version: ['18', '19'] and later installs react@${{ matrix.react-version }}. NPM does not ship a stable react@19 package yet, so npm install react@19 react-dom@19 --no-save fails with a 403/404 whenever the matrix picks the 19 value, turning every CI run red. Use an existing prerelease tag (e.g. @next or 19.0.0-rc) or drop the 19 slot until a publishable version exists.

Useful? React with 👍 / 👎.