/**
 * CSS color alpha helper for runtime UI (drawer badges, tinted fills).
 * Keep the algorithm in sync with the inline copy in `src/ui/client.html`.
 */
/**
 * Return a CSS color with the given alpha in [0, 1].
 * Handles `#rgb` / `#rrggbb` and `rgba()` / `rgb()`. Empty or garbage → `transparent`.
 */
export declare function withAlpha(color: string, alpha01: number): string;
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