refactor(streaming): extract the update frame

src/AcDream.App/Input/LocalPlayerRuntimeState.cs

@@ -28,3 +28,25 @@ internal sealed class LocalPlayerControllerSlot : ILocalPlayerControllerSource
 {
     public PlayerMovementController? Controller { get; set; }
 }
+
+internal interface ILocalPlayerModeSource
+{
+    bool IsPlayerMode { get; }
+    bool ChaseModeEverEntered { get; }
+}
+
+/// <summary>
+/// The one mutable local presentation-mode slot. Checkpoint F transfers write
+/// ownership to PlayerModeController; streaming and camera owners only read it.
+/// </summary>
+internal sealed class LocalPlayerModeState : ILocalPlayerModeSource
+{
+    public bool IsPlayerMode { get; set; }
+    public bool ChaseModeEverEntered { get; set; }
+
+    public void ResetSession()
+    {
+        IsPlayerMode = false;
+        ChaseModeEverEntered = false;
+    }
+}