Queue items carry a pre-resolved stream, so play() takes the
provided-stream shortcut and skips the full API fetch that populates
storyboards. The follow-up loadOnlineStreams() call fetched the response
containing them but dropped storyboards on the floor.
Keep the storyboards in loadOnlineStreams() and apply them when none are
set (preserving local storyboards for downloaded playback), and bail out
if the current video changed during the fetch.
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