Add prediction to electric grills (#36241)

* Prediction for EntityHeaterSystem

* Switch to Entity<T>

* meh

* Move popup inside ChangeSetting

* Fix grill visually turning on when changing setting while power is off

* Add note about my failed quest

* Why isn't this an IDE warning?

* Move comment above switch expression in SettingPower

Content.Client/Temperature/Systems/EntityHeaterSystem.cs

@@ -0,0 +1,5 @@
+using Content.Shared.Temperature.Systems;
+
+namespace Content.Client.Temperature.Systems;
+
+public sealed partial class EntityHeaterSystem : SharedEntityHeaterSystem;