Generalize study release-date gating across all studies

src/colossiansStudy.tsx

@@ -97,31 +97,47 @@ function getChapterSummaries(study: StudyProgram) {
   })
 }
 
+function getSectionReleaseDate(section: StudySection): Date | null {
+  const candidateValues = [
+    section?.releasedAt,
+    (section as StudySection & { releaseDate?: string }).releaseDate,
+    (section as StudySection & { availableAt?: string }).availableAt,
+    (section as StudySection & { publishAt?: string }).publishAt,
+  ]
+
+  for (const candidate of candidateValues) {
+    if (typeof candidate !== 'string' || !candidate.trim()) continue
+    const parsed = new Date(candidate)
+    if (!Number.isNaN(parsed.getTime())) return parsed
+  }
+
+  return null
+}
+
 function isNewLesson(section: StudySection): boolean {
-  if (!section.releasedAt) return false
-  const releaseDate = new Date(section.releasedAt)
+  const releaseDate = getSectionReleaseDate(section)
+  if (!releaseDate) return false
   const now = new Date()
   const daysSinceRelease = (now.getTime() - releaseDate.getTime()) / (1000 * 60 * 60 * 24)
   return daysSinceRelease >= 0 && daysSinceRelease <= 14
 }
 
 function isComingSoon(section: StudySection): boolean {
-  if (!section.releasedAt) return false
-  const releaseDate = new Date(section.releasedAt)
+  const releaseDate = getSectionReleaseDate(section)
+  if (!releaseDate) return false
   const now = new Date()
   return releaseDate > now
 }
 
 function isSectionReleased(section: StudySection): boolean {
-  if (!section.releasedAt) return false
-  const releaseDate = new Date(section.releasedAt)
-  if (Number.isNaN(releaseDate.getTime())) return false
+  const releaseDate = getSectionReleaseDate(section)
+  if (!releaseDate) return false
   return releaseDate <= new Date()
 }
 
 function getReleaseDateDisplay(section: StudySection): string {
-  if (!section.releasedAt) return ''
-  const date = new Date(section.releasedAt)
+  const date = getSectionReleaseDate(section)
+  if (!date) return ''
   return date.toLocaleDateString('en-US', { month: 'short', day: 'numeric', year: 'numeric' })
 }
 
@@ -765,12 +781,13 @@ export function ColossiansStudySectionPage({ content }: Props) {
   }
 
   if (!sectionIsReleased) {
+    const releaseDateDisplay = getReleaseDateDisplay(section)
     return (
       <main className="thanks-page" aria-label="Lesson not yet available">
         <div className="thanks-card">
           <p className="eyebrow">{study.title}</p>
           <h1>Lesson Coming Soon</h1>
-          <p>This lesson will be available on {getReleaseDateDisplay(section)}.</p>
+          <p>{releaseDateDisplay ? `This lesson will be available on ${releaseDateDisplay}.` : 'This lesson will be available soon.'}</p>
           <Link to={`/study/${study.slug}`} className="btn-primary">Back to Lessons</Link>
         </div>
       </main>