message: fixed avatar and message box layering
diff: @@ -28,8 +28,9 @@ limitations under the License.
  top: -32px;
  right: 8px;
  user-select: none;
  - // Ensure the action bar appears above over things, like the read marker.
  - z-index: 1;
  + // Ensure the action bar appears above other things like the read marker
  + // and sender avatar (for small screens)
  + z-index: 10;
  // Adds a previous event safe area so that you can't accidentally hover the
  // previous event while trying to mouse into the action bar or from the
  