fix: add comma to substat number formatting

src/lib/substat.ts

@@ -65,6 +65,6 @@ export function buildRollSummary(
       efficiency: roll.efficiency.toFixed(1),
       formatted: roll.isPercent
         ? `${(roll.value * 100).toFixed(1)}%`
-        : Math.round(roll.value).toString(),
+        : Math.round(roll.value).toLocaleString(),
     }));
 }