message: Use the new screencast preview component on the detail page.
diff: <script lang="ts">
  import type { Screencast as ScreencastType } from "../../types/screencasts.type";
  - import Screencast from "../../components/screencasts/screencast.svelte";
  + import ScreencastPreview from "../../components/screencasts/preview.svelte";
  import YouTubeEmbed from "../../components/youtube-embed.svelte";
  export let screencast: ScreencastType;
  {#if screencast.nextScreencast}
  <h2>Next up...</h2>
  - <Screencast
  + <ScreencastPreview
  screencast={screencasts[screencast.nextScreencast]}
  screencastNumber={screencast.nextScreencast}
  />
  