WIP: fix useChat tool calls #46

Job	Run time
demo demo/vercel/react/use-client-transport	1m 35s
test-integration node 20	1m 3s
test node 22	44s
test node 24	48s
check	33s
demo demo/vercel/react/use-chat	1m 33s
test-integration node 22	1m 1s
test-integration node 24	1m 7s
test node 20	42s
build	45s
	9m 51s

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