`literalref` role doesn't work with autogenerated heading targets

[medubelko]

Situation

Automatically-generated heading targets referenced by the ref role don't render as links with the literalref role.

I suspect this is the role's fault, but we should determine if it's something in Kitbash first.

Steps to reproduce

On any of our apps, try:

.. _test-page:

Test page
=========

.. kitbash-field:: craft_application.models.Project name

The :ref:`test-page-name` key.

The :literalref:`test-page-name` key.

Result:

Test page

name

...

The name key.

The test-page-name key.

Environment

I tested using the current Rockcraft stack and the standalone sphinx-roles extension, too.

[jahn-junior]

The reason this doesn't work is because the Kitbash labels get manually added to the standard domain, while internal literalrefs are only resolved in the custom lrd domain.

The reason this custom domain exists is because Sphinx places the content of pending_xref in inline nodes, ignoring any formatting that's applied. I'll propose a solution upstream before closing this, which will hopefully let us drop the custom domain entirely.