/**
 * Subscribes the actively viewed session to its event stream.
 *
 * Event application lives in the hook-free stream engine
 * (`sessionStreamEngine.ts`) managed by `sessionStreamManager.ts`, which keeps
 * engines attached for sessions that are still running in the background so
 * switching sessions never drops streamed chunks. This hook marks the session
 * as active (driving viewer tabs, approvals, and secure-input prompts) and
 * syncs pending approval state from the server.
 */
export declare function useSessionStream(sessionId: string | undefined, enabled?: boolean): void;
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