Form sections hold their children (win32, UIKit); win32 paints gradients, orders zstacks, keeps a tooltipped widget's text - #175

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/