Add Nuggets to global search and RSS-sourced scripture refs to index; v2.0.26

- Raise RSS description truncation from 220 → 800 chars so scripture
  references in episode descriptions are preserved
- Global search now indexes Nuggets podcast episodes from
  /api/nuggets/episodes/all (title, subtitle, description via Fuse)
- Scripture Index (/api/public/scripture-index) now extracts verse
  references from both main podcast and Nuggets RSS descriptions
  using a regex built from the shared BIBLE_BOOKS list; duplicate refs
  across sources are merged by the existing client-side dedup logic
- Export fetchNuggetsEpisodes from nuggets.js for reuse

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/routes/nuggets.js

@@ -9,7 +9,7 @@ function feedUrl() {
   return state.cachedSiteContent?.nuggets?.rssFeedUrl?.trim() ?? ''
 }
 
-async function fetchNuggetsEpisodes() {
+export async function fetchNuggetsEpisodes() {
   const url = feedUrl()
   if (!url) { cache = null; return [] }