export type SessionState = "IDLE" | "COUNTDOWN" | "WARN" | "EXPIRED";
export interface SessionSnapshot {
    state: SessionState;
    remainingMs: number;
    warnBeforeMs: number;
    countdownMs: number;
    idleGraceMs: number;
    idleStartAt: number | null;
    countdownEndAt: number | null;
    lastActivityAt: number | null;
    paused: boolean;
}