- Twitter/X-style post cards: avatar thread line, author + relative timestamp
- Heart like button with optimistic toggle and like count per post
- Comment button with reply count; inline threaded replies always visible
- Compose card with user avatar, borderless textarea, pill Post button
- Horizontal scrollable lesson filter chips (All + per-lesson)
- New POST /api/study-community/posts/:postId/like endpoint (toggle)
- GET community posts now returns likedByMe + likeCount per post
- sanitizeStudyCommunityPosts preserves likedBy array on disk
- Relative timestamps (just now, Xm ago, Xh ago, Xd ago, then date)
- UserAvatar helper renders img or initials fallback consistently
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
nmemmertandClaude Sonnet 4.6
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