Aurora SpotiRip desktop and web app

- Spotify playlist, library, album and artist browsing with in-app playback
- Song, playlist and album downloads via spotdl with YouTube and Bandcamp fallbacks
- Electron desktop app (castLabs Widevine) with a permanent sidebar layout
- Linux and Windows packaging scripts

components/DownloadButton.tsx

@@ -0,0 +1,38 @@
+import { Download, Loader2 } from "lucide-react";
+import { Button } from "./Button";
+import type { InputType as DownloadRequest } from "../endpoints/spotify-download_POST.schema";
+import type { useSpotifyDownload } from "../helpers/useSpotifyDownload";
+import styles from "./DownloadButton.module.css";
+
+type Props = {
+  downloads: ReturnType<typeof useSpotifyDownload>;
+  busyKey: string;
+  label: string;
+  request: DownloadRequest;
+  text?: string;
+  size?: "sm" | "icon-sm";
+  variant?: "primary" | "outline" | "ghost";
+};
+
+export function DownloadButton({ downloads, busyKey, label, request, text, size = "icon-sm", variant = "ghost" }: Props) {
+  if (!downloads.canDownload) return null;
+  const busy = downloads.busyKeys.has(busyKey);
+  const Icon = busy ? Loader2 : Download;
+  return (
+    <Button
+      variant={variant}
+      size={size}
+      disabled={busy}
+      aria-label={text ? undefined : `Download ${label}`}
+      title={text ? undefined : "Download"}
+      onClick={(event) => {
+        event.stopPropagation();
+        downloads.startDownload(busyKey, label, request);
+      }}
+      onKeyDown={(event) => event.stopPropagation()}
+    >
+      <Icon size={14} className={busy ? styles.spin : undefined} />
+      {text}
+    </Button>
+  );
+}