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

pages/spotify.callback.module.css

@@ -0,0 +1,60 @@
+.page {
+  min-height: 100vh;
+  display: grid;
+  place-items: center;
+  align-content: center;
+  gap: 26px;
+  padding: 24px;
+  color: var(--foreground);
+  background: var(--background);
+  font-family: var(--font-family-base);
+}
+
+.page > img {
+  width: min(380px, 78vw);
+  max-height: 112px;
+  object-fit: contain;
+}
+
+.message {
+  width: min(420px, 100%);
+  padding: 24px;
+  text-align: center;
+  background: var(--card);
+  border: 1px solid var(--border);
+  border-radius: 4px;
+}
+
+.message > svg {
+  color: var(--primary);
+}
+
+.message strong {
+  display: block;
+  margin-top: 10px;
+  font: 600 1.05rem/1.2 var(--font-family-display);
+}
+
+.message p {
+  margin: 8px 0 0;
+  color: var(--muted-foreground);
+  font-size: .84rem;
+}
+
+.message button {
+  margin-top: 18px;
+  padding: 8px 14px;
+  color: var(--primary-foreground);
+  background: var(--primary);
+  border: 0;
+  border-radius: 3px;
+  cursor: pointer;
+}
+
+.spinner {
+  animation: spin .9s linear infinite;
+}
+
+@keyframes spin {
+  to { transform: rotate(360deg); }
+}