Add `messages` parameter to `chat_ui()` and `Chat.ui()`; revert #1593#1736

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cpsievert merged 3 commits intomainfrom

chat-starting-messages

Oct 15, 2024

Commits on Oct 15, 2024

Revert "Delay sending of chat UI messages until reactive graph is flushed (#1593)"
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Add messages parameter to .ui() and chat_ui()
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Bring back dynamic UI test; but with messages passed to .ui()
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