iOS 1.0 RC 2: Plex streams under upload caps, shuffle and album radio stations, Recently Added list, photo covers, crossfade

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ios/Stemify/Cache/Downloads.swift

@@ -244,7 +244,7 @@ final class Downloads: @unchecked Sendable {
                 sources = entry.stems.map { (PlaybackManager.stemKey(entry, $0.file, $0.size, q), stems.fileUrl(entry, $0, q)) }
             } else {
                 guard let part = t.partKey else { throw PlainError("No file on the server") }
-                sources = [(PlaybackManager.plexKey(t), plex.partUrl(part))]
+                sources = [(PlaybackManager.plexKey(t), plex.streamUrlNow(t) ?? plex.partUrl(part))]
             }
             update { m in
                 m[key]?.keys = sources.map(\.0)