feat: implement client-side state management hooks

- Created useSearch hook for search state and debouncing
- Created useFilters hook for filter state management
- Created useOptimisticUpdate hook for optimistic UI updates
- Created useScrollPosition hook for scroll preservation
- Updated SearchBar, GlobalSearch, and ListDetailView to use new hooks
- Added comprehensive documentation for all hooks

Validates: Requirements 6.4, 7.3, 7.4, 8.3
Task: 9. Implement client-side state management

hooks/index.ts

@@ -0,0 +1,10 @@
+/**
+ * Custom hooks for client-side state management
+ * Implements task 9 from the Ultimate Lists App specification
+ */
+
+export { useSearch } from './useSearch'
+export { useFilters } from './useFilters'
+export type { FilterState } from './useFilters'
+export { useOptimisticUpdate, useOptimisticList } from './useOptimisticUpdate'
+export { useScrollPosition, useContainerScrollPosition } from './useScrollPosition'