Nothing listened for bus.emit('toast'), so sync errors, login-required notes
and group messages silently vanished. engine.js now shows them with a new
ui.toast (parchment note with a sticker and a sound). Friend rows: Challenge is
a green game button, chat a sticker button. shoot.mjs --with-friend makes a
befriended second throwaway account.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>