[Bug]: Container copy doesn't expand host path correctly.

[JaewonHur]

I have done the following

• I have searched the existing issues
• If possible, I've reproduced the issue using the 'main' branch of this project

Steps to reproduce

container run -d --rm --name foo alpine:latest sleep 1d
touch file
container cp file foo:/root/

This fails with

Error: failed to copy into container foo (cause: "internalError: "failed to copy into container foo (cause: "notFound: "copyIn: source not found '/file'"")"")

Following succeeds

container cp $PWD/file foo:/root/

Problem description

Container cp fails to expand host path.

Environment

ProductName:		macOS
ProductVersion:		26.2
BuildVersion:		25C56
ReleaseType:		Internal

Code of Conduct

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