fix(maestro): handle 202 as no-body response in jsonOrError

The daemon returns 202 Accepted when a structured prompt is queued.
jsonOrError only skipped res.json() for 204, so the empty 202 body
caused a JSON parse error.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/api.ts

@@ -39,7 +39,7 @@ export class ApiRequestError extends Error {
 
 async function jsonOrError<T>(res: Response): Promise<T> {
   if (res.ok) {
-    if (res.status === 204) return undefined as unknown as T;
+    if (res.status === 204 || res.status === 202) return undefined as unknown as T;
     return (await res.json()) as T;
   }
   try {