/**
 * Lightweight check for the Connect browser extension.
 * Does NOT launch Connect — only checks if the extension is installed.
 *
 * Chrome/Firefox/Edge: dispatches AsperaConnectCheck, listens for window message
 * Safari: dispatches AsperaConnectCheck, listens for document event
 */
export declare const detectConnectExtension: (timeoutMs: number) => Promise<boolean>;