Fleet vision affects battles

Fleet vision is nice enough when you're exploring, but provides little benefit in combat. (So if a hero is leading a fleet but not exploring, there's little point in giving that hero vision-increasing skills, and there's no real debate over whether the Sophon Free Move would be better for a combat ship than even more powerful engines.) But if one fleet has better sensors than the other, it would be able to get the drop on the other in combat. A fleet with a higher vision radius should have the element of surprise, which should probably involve being able to fire off a first, unanswered salvo, and might also involve additional wrinkles:

• A beam weapon arrives faster than a kinetic weapon, and in an obvious line, so a surprise beam attack might cause additional damage but allow the enemy to start firing back faster.
• Torpedos appear to be slower and bigger than the other weapons, so the ship they're aimed at could see them coming; at the same time, they can maneuver after firing, so the fleet they're aimed at might not be able to figure out where they were fired from. A surprise torpedo attack might cause normal torpedo damage, but the fleet with vision advantage might be able to fire more torpedo salvos before the other side can start firing back.
• Maybe a fleet with greater vision range that's traveling past one system on the way to another would be able to avoid a blockade of that system (and one with lower vision range wouldn't be able to).