Episode highlights per series: tag by lane, group on Episodes page, move to Finished Book when series ends; v2.9.1

- Highlights get a Series field (Lane A / Lane B / General); legacy highlights count as Lane A
- Episodes page groups highlights under each series' title
- Ending a series (scheduled or manual) moves only that series' highlights onto its Finished Book page; other lane and General stay
- Archived highlights keep working: detail pages, sitemap, scripture index and search include them

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

server/routes/public.js

@@ -102,7 +102,10 @@ export function register(app) {
       }
     }
     // Dynamic episode highlight URLs
-    const highlights = Array.isArray(state.cachedSiteContent?.podcastFeaturedLinks) ? state.cachedSiteContent.podcastFeaturedLinks : []
+    const highlights = [
+      ...(Array.isArray(state.cachedSiteContent?.podcastFeaturedLinks) ? state.cachedSiteContent.podcastFeaturedLinks : []),
+      ...(Array.isArray(state.cachedSiteContent?.finishedBooks) ? state.cachedSiteContent.finishedBooks.flatMap(book => (Array.isArray(book?.highlights) ? book.highlights : [])) : []),
+    ]
     for (const ep of highlights) {
       if (ep.id) urls.push(`${root}/episodes/${encodeURIComponent(ep.id)}`)
     }
@@ -195,7 +198,10 @@ export function register(app) {
   app.get('/api/public/scripture-index', async (_req, res) => {
     const content = state.cachedSiteContent
     const allStudies = Array.isArray(content?.studies) ? content.studies : []
-    const allEpisodes = Array.isArray(content?.podcastFeaturedLinks) ? content.podcastFeaturedLinks : []
+    const allEpisodes = [
+      ...(Array.isArray(content?.podcastFeaturedLinks) ? content.podcastFeaturedLinks : []),
+      ...(Array.isArray(content?.finishedBooks) ? content.finishedBooks.flatMap(book => (Array.isArray(book?.highlights) ? book.highlights : [])) : []),
+    ]
     const cutoff = new Date()
     const entries = []