message: Add text truncate mixin to subheader
diff: @import '../globals';
  @import "../animations/_modal.scss";
  +@import "../mixins/text-truncate";
  .q-subheader {
  border-bottom: 1px solid $border-gray;
  align-content: center;
  -
  .q-icon {
  display: flex;
  font-size: 20px;
  align-items: center;
  }
  -
  .left-icon {
  @extend .q-icon;
  flex: 1;
  justify-content: flex-end;
  }
  -
  .title {
  margin-left: 5px;
  margin-right: 5px;
  line-height: 52px;
  width: 75vw;
  text-align: center;
  - text-overflow: ellipsis;
  - white-space: nowrap;
  - overflow: hidden;
  + @include text-truncate;
  }
  -
  -
  }
  -
  .right-icon {
  @extend .q-icon;
  flex: 1;
  