refactor(itinerary-summary): add fixme for Block styled-component

Author: landonreed

Diff for: lib/components/narrative/default/itinerary-summary.js

@@ -3,6 +3,8 @@ import React, { Component } from 'react'
 import PropTypes from 'prop-types'
 import styled from 'styled-components'
 
+// FIXME: Some of these must be marked !important, otherwise the summary-block
+// mode-block css class selectors will take precedence.
 const Block = styled.div`
   background-color: ${props => getModeColor(props.mode)};
   height: 24px!important;