export interface TimeTrackerHeaderButtonProps {
    /** Dimming/disabled passthrough from the header. */
    className?: string;
    disabled?: boolean;
}
/**
 * Header affordance for the time tracker. Renders nothing unless wrapped in a
 * `<TimeTrackerProvider>`. The trigger is the standard `HeaderButton`; when a
 * session is active it also shows the live elapsed time. The popup is a Radix
 * Popover anchored under the button (not a modal/drawer). Inside AppLayout the
 * dim backdrop covers only the main content area (header and sidebar stay
 * interactive) and the popup joins the layout's panel coordination — opening
 * it closes any open in-layout drawer and vice versa. Outside AppLayout it
 * falls back to a viewport-wide backdrop.
 */
export declare function TimeTrackerHeaderButton({ className, disabled }: TimeTrackerHeaderButtonProps): import("react").JSX.Element | null;
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