/**
 * Alpha-composites a foreground color over an opaque background and returns
 * the resulting opaque hex (`#rrggbb`).
 *
 * Used by `GlassView` on platforms without native backdrop blur: the glass
 * tint (e.g. `#ffffffbf`) is flattened over the theme `--background` so the
 * fallback layer approximates the frosted look without translucency.
 *
 * Channels are blended in linear-light space (sRGB values are decoded before
 * the lerp and re-encoded after). Blending gamma-encoded values directly
 * biases the mix darker whenever a light tint sits over a darker backdrop;
 * linear-light compositing is the physically correct model of light passing
 * through a translucent layer and better matches the native blur result.
 *
 * Returns `color` unchanged when either string cannot be parsed.
 *
 * @param color - Foreground color (may include alpha), from `useThemeColor`
 * @param background - Opaque background color to composite onto
 * @returns Opaque hex string approximating the composited result
 */
export declare function flattenColorOverBackground(color: string, background: string): string;
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