- Add shared rendering helpers for width-aware tree labels, truncation, and no-wrap Rich text.
- Preserve tab index and group window metadata through the extension and SDK factories.
- Render tab trees in browser/window/index order with grouped tab details and optional shortened URLs.
- Reuse the tab tree labels in window trees to keep output compact and consistent.
- Cover legacy missing-index responses, grouped/collapsed tabs, URL display, and rendering helpers with tests.
