add-npm-dependency

This skill MUST be used whenever the task involves adding, installing, or upgrading an npm package/library/dependency in this project. Use when the user asks to "add a library", "install <package>", "use <package>", "add a dependency", "bump/upgrade a package", or any change to package.json dependencies. Covers the latest-version policy, esbuild renderer bundling, manual CSS copy, native module rebuilds, and the…