message: Fix hidden diagnostics.
diff: }
  .session .prompt {
  + --prompt-padding: calc(calc(var(--prompt-height) - var(--prompt-font-size)) / 2.5);
  position: absolute;
  contain: layout;
  bottom: var(--footer-height);
  height: var(--prompt-height);
  width: 100%;
  - padding: calc(calc(var(--prompt-height) - var(--prompt-font-size)) / 2.5) 0;
  + padding-top: var(--prompt-padding);
  line-height: 1.3;
  display: grid;
  grid-template-areas: "prompt-decoration prompt-content";
  }
  .session .prompt-decoration {
  + --decoration-height: calc(var(--prompt-font-size) * 1.3);
  grid-area: prompt-decoration;
  position: relative;
  overflow: hidden;
  + height: var(--decoration-height);
  z-index: 2;
  }
  .session .prompt-decoration .square {
  position: absolute;
  display: inline-block;
  - --size: calc(var(--prompt-font-size) * 1.3);
  - width: var(--size);
  - height: var(--size);
  + width: var(--decoration-height);
  + height: var(--decoration-height);
  background-color: var(--text-color);
  z-index: 1;
  filter: brightness(50%);
  }
  .session .prompt-decoration .rhombus {
  - left: calc(var(--prompt-font-size) * 0.39);
  + left: calc(var(--decoration-height) * 0.39);
  transform: rotate(45deg);
  }
  