Shards damage barefoot users + steptrigger-related general cleanup (#9585)

Content.Server/Explosion/Components/TriggerOnStepTriggerComponent.cs

@@ -0,0 +1,10 @@
+namespace Content.Server.Explosion.Components;
+
+/// <summary>
+/// This is used for entities that want the more generic 'trigger' behavior after a step trigger occurs.
+/// Not done by default, since it's not useful for everything and might cause weird behavior. But it is useful for a lot of stuff like mousetraps.
+/// </summary>
+[RegisterComponent]
+public sealed class TriggerOnStepTriggerComponent : Component
+{
+}