Target is struggling with weak store traffic and declining profit margins.Retailer Target (TGT -2.21%) is struggling to navigate a difficult environment. The company's stores are losing traffic, and profit margins are contracting, partly due to tariffs.A new CEO could help turn things around, but the company's second-quarter earnings were not what investors wanted to see. Here are three key trends Target investors need to keep an eye on as the company attempts to return to growth. 1. The stores are struggli ...