feat: enhance jobs list stats with tooltips, icons, and refresh count

- Add Tooltip UI component for styled hover tooltips
- Replace native title attributes with Tooltip on all job stats
- Add refresh icon (green) showing actual refreshed count for metadata refresh
- Add icon+tooltip to scanned files stat
- Add icon prop to StatBox component
- Add refreshed field to stats_json types
- Distinct tooltip labels for total links vs refreshed count

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/backoffice/app/components/ui/index.ts

@@ -19,3 +19,4 @@ export {
 } from "./Form";
 export { PageIcon, NavIcon, Icon } from "./Icon";
 export { CursorPagination, OffsetPagination } from "./Pagination";
+export { Tooltip } from "./Tooltip";