Add to cart waits for the reply, and a pending question shows no thumbs

Two fixes to the chat, on the web tag, the public link and the playground.

Add to cart during a reply. A shopper who tapped Add to cart while the assistant was still writing could see their message twice and end up with a broken chat panel. The tap is now kept and sent once the reply finishes. If the reply ends on a clarifying question, it waits until the shopper has answered or moved past the question, so the question is never cancelled under them. The button still switches to Added straight away, so the shopper sees the same thing as before. Several taps during one reply go out one after another, in order, each after the assistant has answered the previous one, and stopping the reply doesn't cancel them. This covers the product carousel, product detail and product comparison cards. A message sent from your own page with auto-send already waited for the reply in progress; it now also waits behind a tap made in the panel, and for a question the reply ends on.

No rating under a pending question. When the assistant's turn ended on a clarifying question, thumbs-up and thumbs-down still showed under that message, with no answer yet to rate. In the live chat they now appear once the shopper has answered or moved past the question. In the playground's Technical view, the copy, refresh, "more" and response-time controls wait the same way. Conversation transcripts in the dashboard are unchanged.

Nothing to configure.