chat: support sendToNewChat option and SendToNewChatAction delegation… #286767
+143
−17
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fixes #286724
This change implements a new option so callers can submit a chat request and immediately return the UI to an empty/new chat view (submit in background). It addresses https://github.com//issues/286724.
Adds IChatAcceptInputOptions.sendToNewChat?: boolean.
When set, ChatWidget captures the session, cancels any in-flight request for that session, clears the widget (returns UI to empty chat), and submits the request to the original session resource in the background.
Updates SendToNewChatAction to delegate to widget.acceptInput(..., { sendToNewChat: true }) instead of manual clear+submit.
Adds unit tests validating delegation and the _acceptInput send+clear behavior.