Authoring: serialize pingKey default, NetworkSimulator preset tweak

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Scenes/Main.unity

@@ -813,7 +813,7 @@ MonoBehaviour:
   m_EditorClassIdentifier: Unity.Multiplayer.Tools.NetworkSimulator.Runtime::Unity.Multiplayer.Tools.NetworkSimulator.Runtime.NetworkSimulator
   m_PresetAsset: {fileID: 0}
   m_PresetReference:
-    rid: 4015181309769679106
+    rid: 4015181309769679113
   m_Scenario:
     rid: -2
   m_IsScenarioSettingsFolded: 0
@@ -823,7 +823,7 @@ MonoBehaviour:
     RefIds:
     - rid: -2
       type: {class: , ns: , asm: }
-    - rid: 4015181309769679106
+    - rid: 4015181309769679113
       type: {class: NetworkSimulatorPreset, ns: Unity.Multiplayer.Tools.NetworkSimulator.Runtime, asm: Unity.Multiplayer.Tools.NetworkSimulator.Runtime}
       data:
         <Name>k__BackingField: 'Mobile 2G [CDMA & GSM, ''00]'
@@ -4962,6 +4962,7 @@ MonoBehaviour:
   firstPerson: {fileID: 582951480}
   switchKey: 3
   startModeIndex: 0
+  pingKey: 19
   playersCollide: 0
 --- !u!4 &1516578028
 Transform: