Expand design options for Custom Link block in navigation block

[annezazu]

What problem does this address?

As part of the twelfth call for testing for the FSE Outreach Program, feedback came in around how it's not currently possible to create button like menu items using the navigation block:

I ran into two primary issues with this experiment. One of the problems I had a year ago with FSE Outreach 4 was creating a menu that had button-like links. This basic design is still impossible with the Navigation block, at least with the core design tools. Users can add a background to the entire Navigation block but not to the individual menu items. How did I do it? I used a Buttons block instead. The more I think about it now, the more I like the Buttons block alternative. However, there is no way to wrap this in a <nav> tag to define it as a navigation element.

Here's the design in question:

What is your proposed solution?

In chatting with @jasmussen in this issue #23293 (comment), it became clear another issue would be advantageous specifically around options for the page links block, since that goes beyond just more separator options. Specifically, adding these options:

• Individual background and text colors
• Padding control
• Border and border radius
• Setting block gap options
• The ability to configure the page link block in Styles to set the design for all instances