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 
We should be able to rely on `c.render_style` being set correctly by the time we're in `add_props`.