Highlight SAM positions after pressing 6

**Is your feature request related to a problem? Please describe.**
Player has 40 SAMs. I am unable to locate them. There is just one huge circle around all his territory because everything is covered. Cannot find SAMs to determine destroy tactic.

**Describe the solution you'd like**
Whenever I press 6, don't only show the circles around the SAMs that shows their range, but also highlight all SAMs (perhaps only of the enemy I am hovering over).

**Describe alternatives you've considered**
None.

How do I know where to target this player? (Sorry, couldn't take a screenshot with the hover effect active).

Start by tracing the handler for pressing 6 and the rendering of SAM range circles. Check how the hovered enemy is identified, then verify that pressing 6 visibly highlights the relevant SAM positions while preserving the existing range display.

Written by the indexing model from the issue text.