[mertkayacs]

When the -in URL can't be reached, caire panics:

$ caire -in http://127.0.0.1:9/x.jpg -out out.jpg -preview=false
panic: runtime error: invalid memory address or nil pointer dereference
...
github.com/esimov/caire/utils.DownloadImage(...)
	utils/download.go:19

http.Get returns a nil response along with the error, and the error message reads res.Status. I wrapped the original error instead, so it now prints:

Failed to load the source image: unable to download image file from URI: Get "http://127.0.0.1:9/x.jpg": dial tcp 127.0.0.1:9: connect: connection refused

The test points DownloadImage at a closed httptest server. go vet and the tests pass on Go 1.22 and 1.26 (face detection tests left to CI).