/**
 * Format a token count for compact UI display.
 *
 * Examples: 42 -> "42", 5600 -> "5.6k", 1234567 -> "1.2M".
 *
 * Used in TUI sidebar and dialog rendering for compression aggregates.
 */
export declare function formatTokenCount(n: number): string;
/**
 * Compute savings percent from original/compressed token counts.
 * Returns null when original is 0 (no division).
 */
export declare function compressionSavingsPercent(original: number, compressed: number): number | null;
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