RadioGroup crashes slint live preview

### Bug Description As soon as I put a RadioGroup in a UI, I get the following crash: ``` thread 'main' (14861802) panicked at internal/interpreter/dynamic_item_tree.rs:1142:25: Native type not registered: RadioGroup note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace 2026-07-02T12:32:38.707023Z ERROR slint_lsp::preview::connector::native: The Slint live preview crashed! Please open a bug on the [Slint bug tracker](https://github.com/slint-ui/slint/issues). ``` ### Reproducible Code (if applicable) ```slint export component Yolo inherits Window { RadioGroup { title: "time"; orientation: Orientation.horizontal; RadioButton { text: "yolo"; } RadioButton { text: "ohay"; } } } ``` ### Environment Details - Slint Version: Version 1.17.0 (20260625.035314) - Platform/OS: MacOS - Programming Language: / - Backend/Renderer: / ### Product Impact - The UI for our product. - It's an inconvenience we can workaround, but still a fairly annoying one as it renders the widget unusable with the preview, requiring running the full app for testing. We're considering replacing radio buttons with a custom widget to work around the issue - which is unpleasant.