Add release date and episode # columns to admin lesson list with inline date editing; use local time for release dates; v2.8.2

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

server/helpers.js

@@ -268,6 +268,7 @@ function sanitizeColossiansStudySections(value) {
         chapter: Number.isInteger(item.chapter) && item.chapter >= 1 && item.chapter <= 999 ? item.chapter : 1,
         reference: typeof item.reference === 'string' ? item.reference.trim().slice(0, 40) : '',
         title: typeof item.title === 'string' ? item.title.trim().slice(0, 160) : '',
+        episodeNumber: typeof item.episodeNumber === 'string' || typeof item.episodeNumber === 'number' ? String(item.episodeNumber).trim().slice(0, 20) : '',
         audioEmbedUrl: sanitizeUrl(item.audioEmbedUrl),
         passageText: typeof item.passageText === 'string' ? item.passageText.trim().slice(0, 12000) : '',
         summary: typeof item.summary === 'string' ? item.summary.trim().slice(0, 600) : '',