RNG timers for IEDs + small tweaks (#22099)

Content.Server/Explosion/EntitySystems/TriggerSystem.OnUse.cs

@@ -4,7 +4,6 @@ using Content.Shared.Examine;
 using Content.Shared.Interaction.Events;
 using Content.Shared.Popups;
 using Content.Shared.Verbs;
-using Robust.Shared.Player;
 
 namespace Content.Server.Explosion.EntitySystems;
 
@@ -18,6 +17,7 @@ public sealed partial class TriggerSystem
         SubscribeLocalEvent<OnUseTimerTriggerComponent, ExaminedEvent>(OnExamined);
         SubscribeLocalEvent<OnUseTimerTriggerComponent, GetVerbsEvent<AlternativeVerb>>(OnGetAltVerbs);
         SubscribeLocalEvent<OnUseTimerTriggerComponent, EntityStuckEvent>(OnStuck);
+        SubscribeLocalEvent<RandomTimerTriggerComponent, MapInitEvent>(OnRandomTimerTriggerMapInit);
     }
 
     private void OnStuck(EntityUid uid, OnUseTimerTriggerComponent component, EntityStuckEvent args)
@@ -114,6 +114,16 @@ public sealed partial class TriggerSystem
         }
     }
 
+    private void OnRandomTimerTriggerMapInit(Entity<RandomTimerTriggerComponent> ent, ref MapInitEvent args)
+    {
+        var (_, comp) = ent;
+
+        if (!TryComp<OnUseTimerTriggerComponent>(ent, out var timerTriggerComp))
+            return;
+
+        timerTriggerComp.Delay = _random.NextFloat(comp.Min, comp.Max);
+    }
+
     private void CycleDelay(OnUseTimerTriggerComponent component, EntityUid user)
     {
         if (component.DelayOptions == null || component.DelayOptions.Count == 1)

Content.Server/Explosion/EntitySystems/TriggerSystem.cs

@@ -25,6 +25,7 @@ using Content.Shared.Mobs;
 using Content.Shared.Mobs.Components;
 using Content.Shared.Weapons.Ranged.Events;
 using Robust.Shared.Audio.Systems;
+using Robust.Shared.Random;
 
 namespace Content.Server.Explosion.EntitySystems
 {
@@ -62,6 +63,7 @@ namespace Content.Server.Explosion.EntitySystems
         [Dependency] private readonly SharedAudioSystem _audio = default!;
         [Dependency] private readonly SharedTransformSystem _transformSystem = default!;
         [Dependency] private readonly RadioSystem _radioSystem = default!;
+        [Dependency] private readonly IRobustRandom _random = default!;
         [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
 
         public override void Initialize()