Parentheses are almost always used in an article title to disambiguate. They are not commonly used in that way within the article itself. A popup for the title should highlight the undisambiguated title without the (disambiguation) component.
The hovercard for the title "Lightfox (Sweden)" does not have bolded text because within the article itself the subject is referred to only as "Lightfox".
The space before the parentheses should be trimmed off for this comparison, because it may be replaced with punctuation (this is not currently handled generally, which is be a separate bug).
Because it *is* possible for a parentheses to be part of an title that would be in the text, the search should be both for text with and without the parenthesis.