fix: harden generation task polling fallback

src/types.ts

@@ -73,6 +73,7 @@ export interface WebUserSession extends WebApiResultMeta {
     enterpriseAdminUserId?: number | string | null;
     balanceCents?: number;
     enterpriseBalanceCents?: number;
+    maxConcurrency?: number;
     activePackages?: Array<{
       name: string;
       expiresAt: string;