Revert "Add student birthday tracking with celebration banners and admin notification; v1.1.31"

This reverts commit c0a79b9ed0.

src/colossiansStudy.tsx

@@ -23,7 +23,6 @@ type StudyAuthState = {
   totpEnabled?: boolean
   twoFaMethod?: 'app' | 'email' | null
   totpRecoveryCodesRemaining?: number
-  isBirthdayWeek?: boolean
 }
 
 type StudyAuthStatusResponse = {
@@ -37,7 +36,6 @@ type StudyAuthStatusResponse = {
   totpEnabled?: boolean
   twoFaMethod?: 'app' | 'email' | null
   totpRecoveryCodesRemaining?: number
-  isBirthdayWeek?: boolean
 }
 
 type StudyAccountOverview = {
@@ -1260,10 +1258,6 @@ export function ColossiansStudyIndexPage({ content }: Props) {
   const [enrollMessage, setEnrollMessage] = useState('')
   const [studyProgress, setStudyProgress] = useState<StudyProgress>({ completedSectionIds: [] })
   const [progressLoading, setProgressLoading] = useState(false)
-  const [birthdayBannerDismissed, setBirthdayBannerDismissed] = useState(() => {
-    const yr = new Date().getFullYear()
-    return localStorage.getItem(`birthday-banner-dismissed-${yr}`) === '1'
-  })
 
   useEffect(() => {
     let cancelled = false
@@ -1274,9 +1268,7 @@ export function ColossiansStudyIndexPage({ content }: Props) {
           checked: true,
           authenticated: Boolean(data.authenticated),
           username: data.username ?? '',
-          displayName: data.displayName ?? '',
           enrolledStudySlugs: normalizeEnrolledStudySlugs(data.enrolledStudySlugs),
-          isBirthdayWeek: data.isBirthdayWeek === true,
         })
       })
       .catch(() => {
@@ -1359,19 +1351,6 @@ export function ColossiansStudyIndexPage({ content }: Props) {
 
   return (
     <main className="study-index-page" aria-label={`${study.title} study`}>
-      {auth.authenticated && auth.isBirthdayWeek && !birthdayBannerDismissed && (
-        <div role="alert" style={{ background: 'linear-gradient(135deg, #fffbe6 0%, #fff3cc 100%)', borderBottom: '2px solid #f0c930', padding: '0.9rem 1.25rem', display: 'flex', alignItems: 'center', justifyContent: 'space-between', gap: '1rem', flexWrap: 'wrap' }}>
-          <span style={{ fontSize: '1.05rem', color: '#7a5800' }}>
-            🎂 <strong>Happy Birthday{auth.displayName ? `, ${auth.displayName}` : ''}!</strong> Wishing you a wonderful birthday week — we're so glad you're part of this study community. 🎉
-          </span>
-          <button
-            type="button"
-            onClick={() => { setBirthdayBannerDismissed(true); localStorage.setItem(`birthday-banner-dismissed-${new Date().getFullYear()}`, '1') }}
-            aria-label="Dismiss birthday banner"
-            style={{ background: 'none', border: 'none', cursor: 'pointer', color: '#7a5800', fontSize: '1.1rem', lineHeight: 1, padding: '0.2rem 0.4rem', borderRadius: '3px' }}
-          >✕</button>
-        </div>
-      )}
       <section className="section-study-course-hero">
         <div className="section-inner study-course-hero-inner">
           <Breadcrumbs items={[{ label: 'Home', href: '/' }, { label: 'Studies', href: '/study' }, { label: study.title }]} />