- Adds App Home UI extensions (admin.app.home.render) so custom‑distribution apps can build their App Home as a Shopify‑hosted Preact extension, eliminating a separate iframe web server.
- Runs in the admin extension runtime with Polaris components, limited to a 64 KB bundle and restricted browser APIs, ideal for lightweight dashboards or configuration pages.
- CLI support to scaffold, preview, and deploy the extension; can be added to existing apps, while the iframe model remains the default for most apps.