I haven't had to write in a news style too often, but headlines (from AP guidelines at least) are meant to stand entirely on their own and without context.
While I agree that language can and should change, the use of hyperbole, slang, or cliches in a headline can negatively impact the clarity of the headline, which is most important.
Does something like decimate or carnage have two widely accepted meanings now? Then as an editor, I would caution against their use in a headline. Something like "Hundreds sickened in suspected mass food poisoning at New Zealand university" seems fine and is without clickbait.
I think the semicolons are correct too (though the colon you mentioned would add a lot of clarity). This grammar rule comes up infrequently enough that it can be jarring to encounter a semicolon before reaching the end of a properly formed independent clause.
Either ambient instrumental music (lots of Brian Eno) or any music that I know all the words to (so that my brain doesn't have to actively process the lyrics).
This looks awesome! Which TUI framework are you using (if any)?