<h4>Newsfeed Interaction Handlers Fix</h4><ul><li><strong>Fixed:</strong> Comments, replies, likes not working — all 5 interaction handlers (insertComment, likeComment, insertReply, likeReply, likePost) had the same pattern: sendNotification() called BEFORE visual update, and io.emit() called without try/catch. If socket was disconnected, both threw errors that prevented the visual UI update from executing. Reordered all 5 handlers: visual update first, then io.emit and sendNotification wrapped in try/catch. Also added safe JSON parsing to all 5 handlers.</li></ul>