fix: normalize abort signals for fetch

src/signal/client.ts

@@ -1,5 +1,7 @@
 import { randomUUID } from "node:crypto";
 
+import { resolveFetch } from "../infra/fetch.js";
+
 export type SignalRpcOptions = {
   baseUrl: string;
   timeoutMs?: number;
@@ -36,10 +38,14 @@ function normalizeBaseUrl(url: string): string {
 }
 
 async function fetchWithTimeout(url: string, init: RequestInit, timeoutMs: number) {
+  const fetchImpl = resolveFetch();
+  if (!fetchImpl) {
+    throw new Error("fetch is not available");
+  }
   const controller = new AbortController();
   const timer = setTimeout(() => controller.abort(), timeoutMs);
   try {
-    return await fetch(url, { ...init, signal: controller.signal });
+    return await fetchImpl(url, { ...init, signal: controller.signal });
   } finally {
     clearTimeout(timer);
   }
@@ -113,7 +119,11 @@ export async function streamSignalEvents(params: {
   const url = new URL(`${baseUrl}/api/v1/events`);
   if (params.account) url.searchParams.set("account", params.account);
 
-  const res = await fetch(url, {
+  const fetchImpl = resolveFetch();
+  if (!fetchImpl) {
+    throw new Error("fetch is not available");
+  }
+  const res = await fetchImpl(url, {
     method: "GET",
     headers: { Accept: "text/event-stream" },
     signal: params.abortSignal,