Fix NodeJS.Timeout type errors in frontend

- Change NodeJS.Timeout to ReturnType<typeof setTimeout> for browser compatibility
- Fix timeout ref types in GovernanceModelBadge and TeamDashboard
- All TypeScript compilation errors now resolved

frontend/src/components/TeamDashboard.tsx

@@ -68,7 +68,7 @@ export default function TeamDashboard() {
   const [statusDropdownOpen, setStatusDropdownOpen] = useState(false);
   const [governanceModels, setGovernanceModels] = useState<ReferenceValue[]>([]);
   const [hoveredGovModel, setHoveredGovModel] = useState<string | null>(null);
-  const hoverTimeoutRef = useRef<NodeJS.Timeout | null>(null);
+  const hoverTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
 
   // Hover handlers with delayed hide to prevent flickering when moving between badges
   const handleGovModelMouseEnter = useCallback((hoverKey: string) => {