Get ready for a summer of teen mayhem, unless blue-city leaders across the country abandon their commitment to fostering disorder in the name of equity. The hot new thing is a “takeover” — a Gen-Z euphemism for a riot, often inspired by social media and featuring huge mobs and psychotic car stunts. Chicago saw several “teen takeovers” over Memorial Day weekend, with dozens of arrests of “youths” running as old as 28. And one of them saw Rashad Johnson, 18, allegedly plow his vehicle into a