Tap a bubble to open an action menu with Reply + 6 quick reactions.
Reply stashes the target MessageKey and flips the Send button to
"Reply" mode, routing through mesh.send-reply. Reactions call
mesh.send-reaction immediately and render as chips under the target
bubble, collapsed per emoji with a count and self-highlight. Reaction
messages are filtered out of the main chat stream so they don't create
standalone bubbles. Reply bubbles show a "↳ quoted snippet" header
when the target is still in the local window.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
649433b7fd