By Sarah Jean Callahan Just in time for the holidays, one major store is making a comeback. With much of the country sweltering under record heat, it’s unlikely that most people are even thinking of back-to-school sales let alone Christmas shopping. But hard pressed brick-and-mortar retailers have to, even as they face a daunting series of challenges. in addition to the long-standing troubles facing them in a world of online shopping and delivery, retailers are up against supply chain woes, staffing challenges, the highest inflation in 40 years, and rising rates that make inventory decisions e…