Add OBS group management feature and documentation

- Add group_name column to teams table for mapping teams to OBS groups
- Create API endpoints for group creation (/api/createGroup) and bulk sync (/api/syncGroups)
- Update teams UI with group status display and creation buttons
- Implement automatic group assignment when adding streams
- Add comprehensive OBS setup documentation (docs/OBS_SETUP.md)
- Fix team list spacing issue with explicit margins
- Update OBS client with group management functions
- Add database migration script for existing deployments

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

lib/performance.ts

@@ -7,7 +7,7 @@ export function useDebounce<T extends (...args: any[]) => any>(
   callback: T,
   delay: number
 ): T {
-  const timeoutRef = useRef<NodeJS.Timeout>();
+  const timeoutRef = useRef<NodeJS.Timeout | null>(null);
 
   return useCallback((...args: Parameters<T>) => {
     if (timeoutRef.current) {
@@ -159,7 +159,7 @@ export function useSmartPolling(
 ) {
   const isVisible = usePageVisibility();
   const callbackRef = useRef(callback);
-  const intervalRef = useRef<NodeJS.Timeout>();
+  const intervalRef = useRef<NodeJS.Timeout | null>(null);
   
   // Update callback ref
   React.useEffect(() => {