[EuiFieldSearch] Migrate from class to function component #9498
Description
EuiFieldSearch is a search input with incremental search support, clear button, and controlled/uncontrolled modes.
- File:
components/form/field_search/field_search.tsx - Class size: 220 lines
- State:
value - Lifecycle:
componentDidMount,componentWillUnmount
Migration notes:
Lifecycle manages the native search event listener on the input element. Maps to useEffect. Wrapped with withEuiStylesMemoizer.
Acceptance criteria:
- Convert to function component with hooks
- Maintain incremental search behavior
- All existing tests pass