Can we call it "کامبیوتر"?
We use it in slang language, but the formal one is حاسوب or حاسب or حاسب آلي
Yes as a loan word but it would be written like this كمبيوتر
Does this only mean that the cat is literally on the computer, or could it be that the cat is using the computer?
If it was a person, then it means that person is using the computer. But since cats don't use it, then it means that the cat is literally on the computer