Fix binary object handling in multipart/form-data (File / Blob) when using nuxt

[LeiCraft]

When the body is FormData and includes a file object, the unwrapRefs logic would incorrectly convert the File / Blob values to plain JavaScript objects.
This caused binary values to be serialized incorrectly, breaking file upload.

so in order to fix the issue i updated unwrapRefs to correctly preserve File and Blob instances.

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