Boston-based online furniture and home decor retailer Wayfair plans to open its fourth Birch Lane brick-and-mortar store in Florida at Mercato shopping center in North Naples, company officials said. It is set to open in the summer at the 9,994-square-foot former Z Gallerie location, 9100 Strada Place, Unit 2130. Birch Lane, a Wayfair specialty brand that offers a fresh perspective on classic furnishings and decor, has brick-and-mortar locations in Boca Raton, Sarasota and Tampa.