- Added `SnapcompactShapePreview` (`snapcompact-shape-preview.ts`), rendering the highlighted shape variant over the sample text in `snapcompact-shape-preview-doc.md`; `auto` resolves to the active model's winning shape.
- Wired the preview as a footer component below the interactive rows in `settings-selector.ts`.
- Passed `modelApi`, `imageBudget`, and `requestRender` through `SelectorController` so the preview can rasterize against the session model and request repaints.