misc flare fixes (#12942)

Content.Client/Light/EntitySystems/ExpendableLightSystem.cs

@@ -0,0 +1,18 @@
+using Content.Client.Light.Components;
+
+namespace Content.Client.Light.EntitySystems;
+
+public sealed class ExpendableLightSystem : EntitySystem
+{
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<ExpendableLightComponent, ComponentShutdown>(OnLightShutdown);
+    }
+
+    private void OnLightShutdown(EntityUid uid, ExpendableLightComponent component, ComponentShutdown args)
+    {
+        component.PlayingStream?.Stop();
+    }
+}