Fix npm publish workflow not found error

[swingerman]

Install dependencies in the publish job to resolve npm-run-all not found error during npm publish.

The publish job was failing because its prepare script, which runs yarn run css, depended on npm-run-all. However, dependencies were not installed in the publish job, leading to npm-run-all being unavailable. Adding setup-node and yarn install ensures all required dependencies are present before publishing.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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