add logging

Shared/views/SwitchableView.swift

@@ -96,6 +96,8 @@ struct SwitchableView: View {
         .onTapGesture {
             viewType = viewType.next()
             self.headerTypeChanged(viewType)
+            EventLogger.log(event: "switchable_view_header_changed",
+                            withData: ["view_type_id": viewType.rawValue, "days_back": daysBack])
         }
     }
 }