Content update for UI prediction (#27214)

* Content update for UI refactor

* Big update

* Sharing

* Remaining content updates

* First big update

* Prototype updates

* AUGH

* Fix UI comp ref

* Cleanup

- Fix predicted message, fix item slots, fix interaction range check.

* Fix regressions

* Make this predictive

idk why it wasn't.

* Fix slime merge

* Merge conflict

* Fix merge

Content.Shared/Administration/Components/SharedHeadstandComponent.cs

@@ -1,6 +1,9 @@
-namespace Content.Shared.Administration.Components;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Administration.Components;
 
 /// <summary>
 /// Flips the target's sprite on it's head, so they do a headstand.
 /// </summary>
+[NetworkedComponent]
 public abstract partial class SharedHeadstandComponent : Component { }

Content.Shared/Administration/Components/SharedKillSignComponent.cs

@@ -1,5 +1,8 @@
-namespace Content.Shared.Administration.Components;
+using Robust.Shared.GameStates;
 
+namespace Content.Shared.Administration.Components;
+
+[NetworkedComponent]
 public abstract partial class SharedKillSignComponent : Component
 {