fix(render): parse the args based on the zod schema

[IdoPesok]

#1065 Take 3

#1065 was reverted in #1080 due to a bug where the toolCallPayload.func.arguments were a string rather than a Record. In #1113 this behavior was fixed so now that bug should be gone since Zod will be parsing the object.

[lgrammel]

We recommend using streamUI instead of render (which is now deprecated). Would this also apply to streamUI?

[unstubbable]

In streamUI, this is now handled via safeParseJSON, see:

ai/packages/core/rsc/stream-ui/stream-ui.tsx

Lines 261 to 272 in a484892

	const parseResult = safeParseJSON({
	text: value.args,
	schema: tool.parameters,
	});
	if (parseResult.success === false) {
	throw new InvalidToolArgumentsError({
	toolName,
	toolArgs: value.args,
	cause: parseResult.error,
	});
	}