/**
 * Presentation-only adapter: the native SidebarRoot, WorkspaceBrowser, their
 * live slots, handlers, menus, stores and React ancestry all stay mounted in
 * place. No copied session list or private API. Only the sidebar's position,
 * the first grid track, and the title trigger are adapted; disposal restores
 * them. There is no public title/zero-width-sidebar slot in DSH 0.1.5-rc.2.
 */
export declare function installHarnessSessionDropdown(doc: Document): () => void;
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