refactor(feed): single RSS client closes search timeout gap

fetchFeedXml owns headers + 20s timeout; both hand-rolled fetches in
feed.ts (fetchEpisodes, load-more cold path) and searchByFeedUrl route
through it — direct-URL search hung indefinitely before.

src/utils/rss-client.ts

@@ -0,0 +1,31 @@
+/**
+ * RSS feed client — single owner of feed XML fetches: headers, timeout,
+ * and failure folding to null.
+ */
+
+/** Default per-feed fetch timeout (ms). */
+export const FETCH_TIMEOUT_MS = 20_000;
+
+/**
+ * Fetch a feed's raw XML. Identity encoding keeps the response raw; the
+ * Accept list matches what podcast servers send. Any failure (network,
+ * non-ok, timeout) resolves to null — callers must leave data untouched.
+ */
+export const fetchFeedXml = async (
+  url: string,
+  opts?: { timeoutMs?: number },
+): Promise<string | null> => {
+  try {
+    const response = await fetch(url, {
+      headers: {
+        "Accept-Encoding": "identity",
+        Accept: "application/rss+xml, application/xml, text/xml, */*",
+      },
+      signal: AbortSignal.timeout(opts?.timeoutMs ?? FETCH_TIMEOUT_MS),
+    });
+    if (!response.ok) return null;
+    return await response.text();
+  } catch {
+    return null;
+  }
+};

src/utils/search.ts

@@ -1,5 +1,6 @@
 import { searchSourceByType, searchEpisodesByType } from "./source-searcher";
 import { parseRSSFeed } from "../api/rss-parser";
+import { fetchFeedXml } from "./rss-client";
 import { SourceType } from "../types/source";
 import type { PodcastSource, SearchResult } from "../types/source";
 
@@ -81,15 +82,8 @@ export const searchByFeedUrl = async (
   if (!FEED_URL_RE.test(trimmed)) return [];
 
   try {
-    const response = await fetch(trimmed, {
-      headers: {
-        "Accept-Encoding": "identity",
-        Accept: "application/rss+xml, application/xml, text/xml, */*",
-      },
-    });
-    if (!response.ok) return [];
-
-    const xml = await response.text();
+    const xml = await fetchFeedXml(trimmed);
+    if (xml === null) return [];
     const podcast = parseRSSFeed(xml, trimmed);
 
     return [