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>

src/legacyColossiansData.ts

@@ -14,6 +14,7 @@ export type ColossiansStudySection = {
   checkpointPrompt?: string
   checkpointQuestions?: string[]
   releasedAt?: string
+  episodeNumber?: string
 }
 
 function section(