<!-- This is an auto-generated description by cubic. -->
## Summary by cubic
Keep the + button in chat enabled while a message is streaming, so users
can attach files or toggle the token bar without waiting. Removed the
disabled prop from AuxiliaryActionsMenu and stopped passing
disabled={isStreaming} from ChatInput.

<sup>Written for commit fbe88ac6e708be9e06c9d7a8afe08a913905bddf.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->