feat(KB-650): add refresh-on-open effect to usage modal

- Add refresh effect when usage modal opens to get latest usage data\n- Include changeset for usage modal refresh feature

packages/dashboard/app/components/UsageIndicator.tsx

@@ -241,6 +241,21 @@ export function UsageIndicator({ isOpen, onClose }: UsageIndicatorProps) {
   const [isRefreshing, setIsRefreshing] = useState(false);
   const [viewMode, setViewMode] = useState<'used' | 'remaining'>('used');
   const contentRef = useRef<HTMLDivElement>(null);
+  const wasOpenRef = useRef(isOpen);
+
+  // Trigger refresh when modal opens (isOpen transitions from false to true)
+  useEffect(() => {
+    // Only refresh when transitioning from closed to open
+    if (!wasOpenRef.current && isOpen) {
+      // Skip if data is fresh (within 5 seconds) to avoid duplicate requests
+      if (!lastUpdated || Date.now() - lastUpdated.getTime() > 5000) {
+        refresh();
+      }
+    }
+    
+    // Update ref for next render
+    wasOpenRef.current = isOpen;
+  }, [isOpen, lastUpdated, refresh]);
 
   // Load view mode preference from localStorage on mount
   useEffect(() => {