Small bogster theme improvements

[href]

This add two features that have not been added to Bogster from what I can tell:

• A distinct way to show jump labels.
• Primary selection highlight color (see many built-in themes do not have a separate highlight color for the primary selection #3842).

Here's a before / after view for the jump labels:

Before	After

And here's a before after view for the primary selection highlight:

Before	After

I hope this is sufficient as far as PRs go, I've been using these tweaks since 24.03, and I'm finally getting around to upstreaming them.

[the-mikedavis]

\cc @vv9k what do you think of the changes?

[archseer]

I find the jump label a bit jarring perhaps? But it's up to the theme author

[RossSmyth]

My two cents as a Bogster daily driver:

1. I agree with the yellow being jarring. My opinion is just the bold modifier & a light bg is good.

3. I think base2 is too faint for a selection. Playing around making the primary selection base4 and the rest base3 I personally find better.

But it is up to the theme author, as these are already in my config.

[kirawi]

The author of the theme was last active on GitHub a little over a year ago. I think it might be fine to proceed?