Fix comprehensive lint and type errors across codebase

- Replace explicit 'any' types with 'unknown' or specific types
- Fix Jest DOM test setup with proper type definitions
- Resolve NODE_ENV assignment errors using Object.defineProperty
- Fix React Hook dependency warnings with useCallback patterns
- Remove unused variables and add appropriate ESLint disables
- Update documentation with groups feature information
- Ensure all tests pass with proper TypeScript compliance

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

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

app/page.tsx

@@ -35,7 +35,7 @@ export default function Home() {
   const activeSourceIds = useActiveSourceLookup(streams, activeSources);
 
   // Debounced API calls to prevent excessive requests
-  const debouncedSetActive = useDebounce(async (screen: ScreenType, id: number | null) => {
+  const setActiveFunction = useCallback(async (screen: ScreenType, id: number | null) => {
     if (id) {
       const selectedStream = streams.find(stream => stream.id === id);
       try {
@@ -62,7 +62,9 @@ export default function Home() {
         }));
       }
     }
-  }, 300);
+  }, [streams, showError, showSuccess]);
+
+  const debouncedSetActive = useDebounce(setActiveFunction, 300);
 
   const fetchData = useCallback(async () => {
     const endTimer = PerformanceMonitor.startTimer('fetchData');