Obsidian Publish: Call attention to "Add linked" when there's a linked file that hasn't been published yet

Use case or problem

It can be easy to miss that something linked/embedded in a to-be-Published note is not published. The “Add linked” button is there, but if you forget to press it, you might not notice that your published page(s) are broken.

Proposed solution

Detect when a note to-be-Published has linked items that aren’t themselves Published. When this happens, call attention to the “Add linked” button somehow (e.g., make it coloured, or glow, or bounce, or something).

Current workaround (optional)

Don’t forget to hit “Add linked”