Put stream in downloading map on click rather than on dl start

prevents network issue race conditions

src/lib/streamCache.svelte.ts

@@ -18,32 +18,36 @@ if (browser) {
 }
 
 export async function download(stream: StreamSummary) {
-	const res = await fetch(`/media/tracks/${stream.filename}`);
+	if (downloading.has(stream.id) || cached.has(stream.id)) return;
-	if (!res.ok || !res.body) throw new Error('Download failed');
-
-	const total = Number(res.headers.get('content-length') || 0);
-	const reader = res.body.getReader();
-	const chunks: Uint8Array[] = [];
-	let received = 0;
-
 	downloading.set(stream.id, 0);
 
-	while (true) {
+	try {
-		const { done, value } = await reader.read();
+		const res = await fetch(`/media/tracks/${stream.filename}`);
-		if (done) break;
+		if (!res.ok || !res.body) throw new Error('Download failed');
-		chunks.push(value);
+
-		received += value.length;
+		const total = Number(res.headers.get('content-length') || 0);
-		if (total) downloading.set(stream.id, Math.round((received / total) * 100));
+		const reader = res.body.getReader();
+		const chunks: Uint8Array[] = [];
+		let received = 0;
+
+		while (true) {
+			const { done, value } = await reader.read();
+			if (done) break;
+			chunks.push(value);
+			received += value.length;
+			if (total) downloading.set(stream.id, Math.round((received / total) * 100));
+		}
+
+		const root = await navigator.storage.getDirectory();
+		const handle = await root.getFileHandle(stream.id, { create: true });
+		const writable = await handle.createWritable();
+		await writable.write(new Blob(chunks));
+		await writable.close();
+
+		cached.add(stream.id);
+	} finally {
+		downloading.delete(stream.id);
 	}
-
-	const root = await navigator.storage.getDirectory();
-	const handle = await root.getFileHandle(stream.id, { create: true });
-	const writable = await handle.createWritable();
-	await writable.write(new Blob(chunks));
-	await writable.close();
-
-	downloading.delete(stream.id);
-	cached.add(stream.id);
 }
 
 export async function remove(streamId: string) {