/**
 * Resolves the DOM element that receives the floating viewer toolbar.
 *
 * Prefers the canvas container's parent when it lies inside `host`, matching
 * {@link acuiResolveDockMountTarget} so the toolbar stays within the visible
 * viewer clip (not an oversized inner canvas box). Overlay toolbars also fall
 * back to the canvas container itself when that node is inside `host`.
 *
 * In-flow (`inCanvasParent`) toolbars should call
 * {@link acuiResolveDockMountTarget} instead so they share the dock panel's
 * parent exactly and can sit as a flex sibling of the canvas.
 *
 * @param host - Plugin host element (theme root and outer layout).
 * @param mountTarget - Optional explicit toolbar mount element.
 */
export declare function acuiResolveToolbarMountTarget(host: HTMLElement, mountTarget?: HTMLElement): HTMLElement;
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