fix(cover): await bounded cover fetch on cold-cache play

Prefetch alone can't cover every first play (any surface, feeds outside
the FeedPage focus window, quick plays) — the live session showed
cover-art-files empty with zero albumart tracks on a cold-cache play.
play() now serves the disk cache synchronously and, on a miss, awaits the
single-flight fetch with a 1.2s cap (covers fetch in ~300ms typically);
past the cap it plays bare and warms the cache. Verified: cold-cache play
-> cover present at load -> albumart track.

src/hooks/useAudio.ts

@@ -16,7 +16,6 @@ import { onCleanup } from "solid-js";
 import {
 	cachedCoverPath,
 	fetchCoverArt,
-	prefetchCoverArt,
 } from "../utils/cover-art";
 import {
 	createAudioBackend,
@@ -316,13 +315,21 @@ async function play(episode: Episode): Promise<void> {
 		const feedStore = useFeedStore();
 		const feed = feedStore.feeds().find((f) => f.podcast.id === episode.podcastId);
 		const podcastTitle = feed?.customName || feed?.podcast.title || "";
-		// Cover art must NEVER gate playback (it was a curl subprocess blocking
+		// Cover art only applies at file LOAD (the runtime video-add fallback
-		// play() by up to 8s). Serve the disk-cached file synchronously when it
+		// never becomes an albumart track), so a cold-cache play must wait for
-		// exists; on a miss, play bare and warm the cache for the next play —
+		// the fetch or play artless. Serve the disk cache synchronously; on a
-		// runtime video-add can't become an albumart track, so late art only
+		// miss, await the single-flight fetch with a 1.2s cap (covers fetch in
-		// works via the load-time cover-art-files property.
+		// ~300ms typically) — past the cap, play bare and let the fetch warm
+		// the cache for next time.
 		const coverUrl = feed?.podcast.coverUrl;
-		const coverArtPath = coverUrl ? cachedCoverPath(coverUrl) : null;
+		let coverArtPath = coverUrl ? cachedCoverPath(coverUrl) : null;
+		if (coverUrl && !coverArtPath) {
+			const path = await Promise.race([
+				fetchCoverArt(coverUrl),
+				new Promise<null>((resolve) => setTimeout(() => resolve(null), 1200)),
+			]);
+			if (path) coverArtPath = path;
+		}
 
 		// Resume from saved progress if available and not completed
 		const savedProgress = progressStore.get(episode.id);
@@ -339,10 +346,6 @@ async function play(episode: Episode): Promise<void> {
 			coverArtPath: coverArtPath ?? undefined,
 		});
 
-		if (coverUrl && !coverArtPath) {
-			prefetchCoverArt(coverUrl);
-		}
-
 		setCurrentEpisode(episode);
 		setIsPlaying(true);
 		setPosition(startPos);