feat(cli): improve tab and window tree rendering

- 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.

extension/src/core/tab-helpers.ts

@@ -22,6 +22,7 @@ export function tabInfo(t: Tab) {
     windowId: t.windowId,
     active: t.active,
     muted: Boolean(t.mutedInfo && t.mutedInfo.muted),
+    index: t.index,
     groupId: t.groupId >= 0 ? t.groupId : null,
     title: t.title,
     url: t.url || t.pendingUrl || "",