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New features

Client::send_reaction helper Send a reaction to a DM, group, or status@broadcast message in one call. The helper builds the underlying ReactionMessage (including sender_timestamp_ms) and routes the stanza through the standard send path, so retry, fan-out, and phash handling all apply. Pass an empty string to remove a previous reaction. For groups and status, set target_key.participant to the original sender so the receipt can be attributed. See send_reaction. 
use waproto::whatsapp as wa;

let target_key = wa::MessageKey {
    remote_jid: Some(group_jid.to_string()),
    from_me: Some(false),
    id: Some(target_message_id.clone()),
    participant: Some(sender_jid.to_string()), // required for groups/status
};

client.send_reaction(&group_jid, target_key, "🎉").await?;
MessageContext::react shortcut Inside an event handler, MessageContext::react reacts to the incoming message without manually rebuilding the message key — it fills in chat, message ID, and group/status participant for you. 
use whatsapp_rust::bot::MessageContext;

.on_event(|event, client| async move {
    if let Some(ctx) = MessageContext::from_event(&event, client) {
        let _ = ctx.react("👍").await;
    }
})
Newsletter (channel) reactions still go through client.newsletter().send_reaction() because they use a different plaintext stanza format.