You can find "War" listed as a station's status in the system view. For some reason you can't filter for this in the galaxy view. That seems to me like such an obvious missing feature and I'm sure it would be easy to implement.
I really hope that Frontier doesn't intend for Galnet to be the only source of information regarding the locations of conflict zones. If that is their intent then I'm confused as to why they're making the information so hard to find. As a Midshipman, I shouldn't have to read the paper to find out where the Navy is operating.