By Anna Ringstrom STOCKHOLM (Reuters) - IKEA's shopping malls business, one of the world's biggest, has kicked off the sales process for some 500 flats at its first-ever mixed-use retail and residential development, in Changsha in southern China. Cindy Andersen, managing director at Ingka Centres since February, said in an interview she expected flat buyers to start moving in in March 2022, after the adjacent mall opened last month following delays due to the pandemic. Ingka Centres has 45 malls, or "meeting places" as it calls them following a strategy tweak a few years ago, anchored by IKEA furniture stores...