/**
 * Centralized formatting utilities.
 */
/**
 * Format a date as ISO date string (YYYY-MM-DD).
 */
export declare function formatDateISO(date: Date): string;
/**
 * Format an ISO date string for display with locale formatting.
 */
export declare function formatDateLocale(isoString: string): string;
/**
 * Format a duration in milliseconds for human-readable display.
 */
export declare function formatDuration(ms: number): string;
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