Predict ActivatableUIRequiresPower (#28405)

A lot of BUIs aren't going to handle the state coming in cleanly but we can fix em as we find em.

Content.Client/Power/EntitySystems/StaticPowerSystem.cs

@@ -0,0 +1,16 @@
+using Content.Client.Power.Components;
+
+namespace Content.Client.Power.EntitySystems;
+
+public static class StaticPowerSystem
+{
+    // Using this makes the call shorter.
+    // ReSharper disable once UnusedParameter.Global
+    public static bool IsPowered(this EntitySystem system, EntityUid uid, IEntityManager entManager, ApcPowerReceiverComponent? receiver = null)
+    {
+        if (receiver == null && !entManager.TryGetComponent(uid, out receiver))
+            return false;
+
+        return receiver.Powered;
+    }
+}