/** CJK characters occupy 2 terminal columns; padEnd/padStart count
 *  string length (=1 per char), which breaks alignment with mixed text. */
export declare function charColumns(c: string): number;
export declare function visualWidth(s: string): number;
export declare function visualPadEnd(s: string, cols: number): string;
/** Truncate `s` to fit within `maxCols` visual columns, appending "…" when cut. */
export declare function truncateVisual(s: string, maxCols: number): string;
export declare function progressBar(percent: number, width: number): string;
export declare function fmt(n: number): string;
export declare function num(v: unknown): number;
export declare function fmtCost(n: number, symbol?: string, rate?: number): string;
/** 紧凑数字缩写（底部状态栏用）：1234 → "1.2K"，1234567 → "1.2M"。 */
export declare function fmtCompact(n: number): string;
/** 余额数值格式化：≥1 或 0 显示固定 2 位小数；小额（<1）保留精度（最多 6 位），避免抹成 0.00。 */
export declare function formatBalanceAmount(total: string): string;