Enforce floor of 0 on link scores across render styles

:eyeglasses: @bsimpson63 @Deimos 

Not sure if this is the best way to do this, but this makes sure the floor on `Link` scores is consistently enforced throughout the frontend. The second commit fixes another bug that causes scores not to appear next to links loaded via `.compact`'s NER functionality.

Fixes #1205 
I'm not that familiar with the rendering system, do we have access to `params` in `add_props`, or is that too early in the process?