Plain Play requests the default media version (index 0 or the saved
preference), but the offline resolvers rejected the single downloaded
row when a non-default version was downloaded, then threw "No video
URL available" with no client to fall back to.
Three-part fix sharing one matcher (downloadedVersionMatches):
- getPlaybackData falls back to the downloaded version when there is no
client to stream from; the result now carries the effective
mediaIndex/mediaSourceId so cached media info and the committed
session describe the file actually played.
- navigateToVideoPlayer seeds the selection from the download record
for isOffline plays with no explicit version, covering the external
player branch and offline-library plays with a reachable server.
- PlaybackSession.fromContext prefers the result source id over the
requested one, keeping in-player state in sync after a fallback.
Online pinning is untouched: with a live client an explicitly requested
non-downloaded version still streams from the server.
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