Add popup message for activating trigger with hand (#24858)

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

@@ -171,6 +171,8 @@ public sealed partial class TriggerSystem
         if (args.Handled || HasComp<AutomatedTimerComponent>(uid) || component.UseVerbInstead)
             return;
 
+        _popupSystem.PopupEntity(Loc.GetString("trigger-activated", ("device", uid)), args.User, args.User);
+
         HandleTimerTrigger(
             uid,
             args.User,

Resources/Locale/en-US/weapons/grenades/timer-trigger.ftl

@@ -12,3 +12,5 @@ verb-start-detonation = Start detonation
 verb-toggle-start-on-stick = Toggle auto-activation
 popup-start-on-stick-off = The device will no longer activate automatically when planted
 popup-start-on-stick-on = The device will now activate automatically when planted
+
+trigger-activated = You activate {THE($device)}.