Convert all remaining React class components to function components
using hooks (useState, useCallback, useEffect, useRef, useMemo) to
satisfy the react-prefer-function-component ESLint rule.
Key changes:
- Converted components in dashboard, explore, SqlLab, and Chart areas
- Updated associated test files with proper typing
- Fixed JSX.Element return types for components used as JSX
- Added explicit ControlHeader props where needed
- Fixed shouldFocus callback signature in WithPopoverMenu usage
Notable exceptions (not converted):
- ErrorBoundary (uses componentDidCatch)
- DragDroppable (react-dnd requires class instances)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
