/**
 * Resolves backward-compatible overlay color from the old imageOpacity model.
 *
 * Old model: overlay color stored as fully-opaque hex + separate `imageOpacity` (0–100).
 * New model: overlay alpha baked into the hex color itself.
 *
 * Only inverts `imageOpacity` into overlay alpha when the stored color has no
 * alpha channel (fully opaque — the old model). Once a user adjusts alpha via
 * the color picker, the color gains an alpha channel and this function becomes
 * a pass-through, preventing the old `imageOpacity` from overriding user changes.
 */
export declare function resolveBackwardCompatOverlay(color: string, imageOpacity: number, opacityMax: 1 | 100): string;
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