Polish mobile layouts, extract ExpandableText, fix image sizing

- Stack title-hero poster/metadata vertically on mobile (flex-col md:flex-row),
  switch backdrop tall breakpoint from sm to md
- Extract bio expand/collapse logic into reusable ExpandableText component;
  use it in PersonHero and TitleHero
- Fix ContinueWatchingCard image to use fill + sizes instead of fixed
  width/height to avoid layout shift
- Add fade-out gradient on genre chip scrollbar edge on mobile
- Show scaled-down ambient glow on mobile instead of hiding it entirely
- Humanize knownForDepartment labels (Acting→Actor, Directing→Director, etc.)
- Change cast member name from truncate to line-clamp-2 for wrapping
- Hide tooltip arrow via [&>:last-child]:hidden instead of color-matching it
- Apply safe-area-inset padding to HeroBanner content on notched devices

lib/services/webhooks.ts

@@ -178,8 +178,7 @@ async function resolveEpisode(event: WebhookEvent): Promise<{
   seasonNumber: number;
   episodeNumber: number;
 } | null> {
-  const seasonNumber = event.seasonNumber;
-  const episodeNumber = event.episodeNumber;
+  const { seasonNumber, episodeNumber } = event;
   if (seasonNumber == null || episodeNumber == null) return null;
 
   // Strategy 1: Use IMDB ID to find the episode and get show_id