British royalty will soon get a taste of West Marin confection. The upcoming wedding between Prince Harry of Wales and Meghan Markle will feature a lemon elderflower cake baked by Inverness native Claire Ptak. She’s the owner of the London-based boutique bakery Violet Cakes and had previously been the subject of an interview on Ms. Markle’s lifestyle website The Tig. In a statement, Ms. Ptak wrote that she and the couple share the same values…