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.Server/Arcade/BlockGame/BlockGameArcadeComponent.cs

@@ -13,10 +13,10 @@ public sealed partial class BlockGameArcadeComponent : Component
     /// <summary>
     /// The player currently playing the active session of NT-BG.
     /// </summary>
-    public ICommonSession? Player = null;
+    public EntityUid? Player = null;
 
     /// <summary>
     /// The players currently viewing (but not playing) the active session of NT-BG.
     /// </summary>
-    public readonly List<ICommonSession> Spectators = new();
+    public readonly List<EntityUid> Spectators = new();
 }