export parseHex, relativeLuminance, softLightSurface for testing

src/lib/theme-contrast.ts

@@ -28,7 +28,7 @@ export interface AdminPalette {
 }
 
 /** Pure / near-white public surfaces → soft admin paper (less eye strain). */
-function softLightSurface(
+export function softLightSurface(
 	value: string | undefined,
 	softDefault: string,
 ): string {
@@ -262,7 +262,7 @@ export function ensureReadableThemeColors(
 	return out;
 }
 
-function parseHex(value: string): Rgb | null {
+export function parseHex(value: string): Rgb | null {
 	const trimmed = value.trim();
 	const short = /^#([0-9a-f]{3})$/i.exec(trimmed);
 	if (short) {
@@ -282,7 +282,7 @@ function parseHex(value: string): Rgb | null {
 	];
 }
 
-function relativeLuminance(rgb: Rgb): number {
+export function relativeLuminance(rgb: Rgb): number {
 	const [red, green, blue] = rgb.map((channel) => {
 		const value = channel / 255;
 		return value <= 0.04045 ? value / 12.92 : ((value + 0.055) / 1.055) ** 2.4;