fix: derive custom domain URL protocol from client host

Use the configured client host protocol instead of hardcoding https for
custom domain status page links.

client/src/Utils/statusPageUrl.ts

@@ -2,6 +2,23 @@ import { PUBLIC_STATUS_PAGE_PREFIX, type StatusPage } from "@/Types/StatusPage";
 
 const CLIENT_HOST = import.meta.env.VITE_APP_CLIENT_HOST as string | undefined;
 
+const getClientOriginProtocol = (): string => {
+	const source =
+		CLIENT_HOST || (typeof window !== "undefined" ? window.location.origin : undefined);
+	if (!source) {
+		return "https:";
+	}
+
+	try {
+		return new URL(source).protocol;
+	} catch {
+		return "https:";
+	}
+};
+
+const buildCustomDomainOrigin = (customDomain: string): string =>
+	`${getClientOriginProtocol()}//${customDomain}`;
+
 export const getAppHostname = (): string | null => {
 	const source =
 		CLIENT_HOST || (typeof window !== "undefined" ? window.location.origin : undefined);
@@ -33,7 +50,7 @@ export const getStatusPagePublicPath = (
 	statusPage: Pick<StatusPage, "url" | "customDomain">
 ): string => {
 	if (statusPage.customDomain) {
-		return `https://${statusPage.customDomain}`;
+		return buildCustomDomainOrigin(statusPage.customDomain);
 	}
 
 	return `${PUBLIC_STATUS_PAGE_PREFIX}/${statusPage.url}`;
@@ -43,7 +60,7 @@ export const getStatusPagePublicUrl = (
 	statusPage: Pick<StatusPage, "url" | "customDomain">
 ): string => {
 	if (statusPage.customDomain) {
-		return `https://${statusPage.customDomain}`;
+		return buildCustomDomainOrigin(statusPage.customDomain);
 	}
 
 	if (typeof window !== "undefined") {