message: make mod search label text non-selectable
diff: </div>
  <div class='column is-three-quarters'>
  <div v-show="view === 'online'">
  - <div class='sticky-top sticky-top--search border-at-bottom'>
  + <div class='sticky-top sticky-top--search border-at-bottom non-selectable'>
  <div class='card is-shadowless'>
  <div class='card-header-title'>
  <span>Search:&nbsp;&nbsp;</span>
  