Refactor queue item cover image handling to directly access `album_art_uri` from the top-level struct instead of nested metadata, and update return type to use fully qualified path `crate::openapi::QueueSnapshot` for clarity.
Refactor queue item cover image handling to directly access `album_art_uri` from the top-level struct instead of nested metadata, and update return type to use fully qualified path `crate::openapi::QueueSnapshot` for clarity.