Steps away from Hermès, Louis Vuitton, Chanel and Gucci, Cannes ’ famed Croisette has a new luxury player — not another heritage fashion house but Alo , the Los Angeles-based activewear brand betting that wellness is luxury’s new status symbol. The brand has launched a multipronged Riviera takeover, opening permanent retail spaces christened “sanctuaries” in Cannes and Saint-Tropez alongside a series of wellness activations timed to coincide with the film festival. First up is a takeover of the Hotel Martinez pier, opening Tuesday and running through June 14. The pier, revamped along with the beach restaurant last year , will feature 40 custom beds paired with parasols. The décor coordinates with the hotel’s Art Deco style, in shades of beige, ivory and navy, while a custom juice menu will be served sunbed-side.…