Like them or loathe them, the newly triumphant Green leader and New York mayor have full-on youthful charisma – and they’re putting it to work, writes Kat Brown I wasn’t on the finest form on Thursday. The return of the Never-Ending British Grey after Wednesday’s briefest dip into spring had sent me into a porridgy slump. But even I was shocked back to life by a triple shot of razzle-dazzle from New York mayor Zohran Mamdani, Green Party leader Zack Polanski, and Hannah Spencer’s speech as she