expo-widgets: widget 组不能解析单一仓库中的提升包 (覆盖 Metro 配置永远不会监视工作区根目录)

Minimal reproducible example: https://GitHub.com/grayorganization/expo-widgets-monorepo-repro (clone, run the four commands in its README; fails as checked in, passes with the one-line fix shown there). This replaces #49750, which was closed for lacking a repro.