LONDON — In the end, Friday’s wedding between Prince William and Kate Middleton may not have ushered in a new dawn for the frayed royal family or brought a renewed era of optimism to a country beset by financial woes, as some predicted in the overheated countdown to the big day. But it proved that the British still know how to combine pageantry, solemnity and romance (and wild hats) better than anyone else in the world.