grammar - Is "[verbing] you a [noun] as [adjective] as you are" grammatically sound?

Here , "Wishing you a day as lovely as you" looks like a short way of saying
"[I am] wishing you a day [which is] as lovely as you [are]"

If we are okay with leaving out the first two parts "[I am]" & "[which is]", then we might also be okay with leaving out the last part "[are]".

It may not be great literature as such, but it will look fine in Valentine cards, provided the recipients are not grammar Nazis.