interface MessageHoverState {
    hoveredMessageId: string | null;
    setHoveredMessage: (messageId: string | null) => void;
}
/**
 * Tracks which turn the pointer is over. The thread renders one turn as many
 * independent list rows, so hover-driven chrome (header branch button, turn
 * footer actions) coordinates through this store instead of local state.
 */
export declare const useMessageHoverStore: import("zustand").UseBoundStore<import("zustand").StoreApi<MessageHoverState>>;
export declare function useIsMessageHovered(messageId: string): boolean;
/** Mouse handlers that mark a row's turn as hovered. */
export declare function useMessageHoverHandlers(messageId: string): {
    onMouseEnter: () => void;
    onMouseLeave: () => void;
};
export {};
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