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/StatBox.tsx

@@ -4,6 +4,7 @@ interface StatBoxProps {
   value: ReactNode;
   label: string;
   variant?: "default" | "primary" | "success" | "warning" | "error";
+  icon?: ReactNode;
   className?: string;
 }
 
@@ -23,10 +24,13 @@ const valueVariantStyles: Record<string, string> = {
   error: "text-destructive",
 };
 
-export function StatBox({ value, label, variant = "default", className = "" }: StatBoxProps) {
+export function StatBox({ value, label, variant = "default", icon, className = "" }: StatBoxProps) {
   return (
     <div className={`text-center p-4 rounded-lg transition-colors duration-200 ${variantStyles[variant]} ${className}`}>
-      <span className={`block text-3xl font-bold ${valueVariantStyles[variant]}`}>{value}</span>
+      <div className={`flex items-center justify-center gap-1.5 ${valueVariantStyles[variant]}`}>
+        {icon && <span className="text-xl">{icon}</span>}
+        <span className="text-3xl font-bold">{value}</span>
+      </div>
       <span className={`text-xs text-muted-foreground`}>{label}</span>
     </div>
   );