Add Win32 common dialog examples - #183

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

llvm@18 was installed but not linked because llvm@15 is already installed. To link this version, run: brew link llvm@18