Add null check to formatCount function for default zero return

web/client/src/utils/itemUtils.js

@@ -109,6 +109,7 @@ export function getItemEmoji(itemName) {
 
 // Compact number formatting
 export function formatCount(count) {
+  if (count == null) return '0';
   if (count >= 1000000) return `${(count / 1000000).toFixed(1)}M`;
   if (count >= 1000) return `${(count / 1000).toFixed(1)}K`;
   return count.toString();