Now that there are models for the UI, I'd update PreviewData to use those directly. For example, it's a little weird to have

val PreviewEpisodeToPodcasts = listOf(
    EpisodeToPodcast().apply {
        episode = PreviewEpisodes.first()
        _podcasts = PreviewPodcasts
    }
)

and then in the preview itself, it uses asPodcastCategoryEpisode to convert everything. I think PreviewData shouldn't need com.example.jetcaster.core.data.database.* imports anymore.

Done in 1c94c88

Going to merge this in @IanGClifton - if you have any other comments I'll address it in a separate PR. Thanks for your review 🙏