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/JobsList.tsx

@@ -18,6 +18,7 @@ interface Job {
     indexed_files: number;
     removed_files: number;
     errors: number;
+    refreshed?: number;
   } | null;
   progress_percent: number | null;
   processed_files: number | null;