USWDS Grid not working

I recently became aware of this issue and will take a look.

Try this.

Ignore the phpstan stuff. I'll fix that in a separate issue.

I have tested the branch, and it is working as expected.

I did notice two small things that could be part of a separate ticket. The in-code documentation mentions that the structure should be like this:

  /*
   * This registers the structure that will be seen by CKEditor 5 as
   * <uswdsGrid>
   *    <uswdsGridContainer>
   *      <uswdsGridRow>
   *        <uswdsGridCol .. />
   *      </uswdsGridRow>
   *    </gridContainer>
   * </bootstrapGrid>
   * ...
   */

Is uswdsGridContainer used, or is it redundant for uswdsGrid? Is there special cases where it is needed?

The second thing is that I see 'undefined' values in the class attribute of the uswdsGrid:

Automatically closed - issue fixed for 2 weeks with no activity.