For Melissa Morris, the founder of luxury handbag label Métier, attention to detail is an art. Her made in Italy, designed in London leathergoods are more engineered than crafted; handbags are modular, and travel bags are pocketed to perfection. So it should come as no surprise that this approach carries over into all that she does, including how she celebrates her birthdays. On the agenda for her milestone 40th? A journey along the River…