message: Remove graph paper background in schema mode
diff: }
  .cardhost-cards.add,
  -.cardhost-cards.schema,
  .cardhost-cards.adopt {
  background: url("/assets/images/schema-grid-tile.png") center/60px repeat;
  }
  +.cardhost-cards.schema {
  + background-color: var(--ch-deep-background);
  +}
  +
  .card-creator,
  .card-schema-updator {
  display: grid;
  