- **Tag filter bar** appears above the grid whenever any download has tags assigned. Chips for "All" + each unique tag, centered under the heading.
- **Clicking a tag** filters the grid to only matching downloads. Clicking the active tag again (or "All") clears the filter.
- **Empty state** — if a tag has no results it shows a friendly message instead of a blank grid.
- The filter only shows when tags exist — so it's invisible today (your 3 current downloads have no tags) and appears automatically once you start tagging items in the admin.
To use it: go to Admin → Downloads → edit a download item → add tags like `Colossians`, `Worksheet`, `Devotional`. Those tags will show up as filter chips on the public page instantly after publishing.
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**🐛 Bugs fixed**
- Study hub/lesson pages turned gold — CSS merge error with `.study-index-page` fixed
- Lesson announcements not saving — `announcement` field missing from `sanitizeColossiansStudySections` whitelist
- 2FA email method blocked with "not configured" — guard checked `totpSecret` instead of `twoFaMethod`
- `STUDY_REMINDERS_FILE` constant never defined — server would crash on first reminder write
- `sanitizeStudyUsers` stripped all 2FA fields — data lost on every restart
- `scheduleStudyReminders` missing from refactored modules
**✨ Features added**
- Commentary supports paragraph formatting (double newline = new paragraph)
- Lesson announcement banner — full-width gold stripe at top of lesson page
- "Take the Quiz" renamed to "Discussion Questions" throughout
- Students must complete checkpoint before unlocking next lesson (lesson list + Next Lesson button both gate on it)
- No checkpoint questions → simple Mark as Completed button as fallback
- Truth For Life syndication widget on homepage
- Newsletter welcome email updated to your new HTML template
**🔧 Maintenance**
- `server.js` refactored from 6,013 lines into 12 focused modules
nmemmert