message: Fix drop target sizing for store buckets
diff: }
  .sub-section {
  - flex: 1;
  margin-top: 6px;
  margin-bottom: 6px;
  position: relative;
  display: flex;
  flex-direction: row;
  + height: calc(100% - 12px);
  > div {
  white-space: normal;
  }
  }
  +dim-store-bucket {
  + display: block;
  + flex: 1;
  +}
  +
  .sub-bucket {
  min-height: 48px;
  min-height: calc(var(--item-size) + 4px);
  