MDBList and Trakt repeated the rating type, entry matching, and request
body construction; tracker_rating_match.dart now owns them with the
service label passed in. The collection detail screen re-implemented
fetchAndQueueListDownload minus its cellular-blocked branch and now uses
it, and the three showDownloadOptionsAndQueue call sites share
queueDownloadWithFeedback, so the detail action buttons surface a queue
failure as an error snackbar instead of an unhandled async error.
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