/**
 * useAppFocusEffect Hook
 *
 * Safe wrapper around React Navigation's useFocusEffect.
 * Only runs the effect if navigation is ready.
 *
 * @param effect - Callback to run when screen is focused
 *
 * @example
 * ```typescript
 * useAppFocusEffect(
 *   useCallback(() => {
 *     // Runs when screen is focused
 *     return () => {
 *       // Cleanup when screen is unfocused
 *     };
 *   }, [dependency])
 * );
 * ```
 */
export declare function useAppFocusEffect(effect: () => void | (() => void)): void;