fix: align workbench cloud auth validation

internal/workbench/cloud-application.ts

@@ -1,4 +1,5 @@
 import type { WorkbenchApplication } from "./contracts.ts";
+import { normalizeWorkbenchCloudAuthorization } from "./cloud-authorization.ts";
 
 export function createCloudWorkbenchApplication(options: {
   baseUrl: string;
@@ -6,15 +7,14 @@ export function createCloudWorkbenchApplication(options: {
   fetchImpl?: typeof fetch;
 }): WorkbenchApplication {
   if (!options.baseUrl) throw codedError("workbench_cloud_api_url_required", "WORKBENCH_CLOUD_API_URL is required");
-  const authorization = options.authorization.trim();
+  const authorization = normalizeWorkbenchCloudAuthorization(options.authorization);
   if (!authorization) throw codedError("workbench_cloud_api_auth_required", "WORKBENCH_CLOUD_API_AUTHORIZATION is required");
-  const authorizationHeader = /^Bearer\s+/iu.test(authorization) ? authorization : `Bearer ${authorization}`;
   const fetchImpl = options.fetchImpl ?? fetch;
   const request = async (method: string, route: string, body: Record<string, unknown> | undefined, actor: { id: string; role?: string | null }) => {
     const response = await fetchImpl(`${options.baseUrl.replace(/\/$/u, "")}${route}`, {
       method,
       headers: {
-        authorization: authorizationHeader,
+        authorization,
         "content-type": "application/json",
         "x-workbench-activity-dispatch": "1",
         "x-hwlab-actor-id": actor.id,

internal/workbench/cloud-authorization.ts

@@ -0,0 +1,5 @@
+export function normalizeWorkbenchCloudAuthorization(value: string) {
+  const authorization = value.trim();
+  if (!authorization) return "";
+  return /^Bearer\s+/iu.test(authorization) ? authorization : `Bearer ${authorization}`;
+}