refactor(runtime): extract local teleport and player mode

Move local teleport, player-mode, animation, shadow, and sealed-dungeon lifetimes out of GameWindow. Make player-mode entry transactional and isolate approach completions by controller lifetime and approach generation so stale callbacks cannot affect replacements.

Co-authored-by: Codex <noreply@openai.com>

tests/AcDream.App.Tests/Rendering/CameraControllerTests.cs

@@ -121,4 +121,30 @@ public class CameraControllerTests
         Assert.Null(ctl.Chase);
         Assert.Null(ctl.RetailChase);
     }
+
+    [Fact]
+    public void RestoreState_ReestablishesPriorCameraAfterNotificationFailure()
+    {
+        var orbit = new OrbitCamera();
+        var ctl = new CameraController(orbit, new FlyCamera());
+        CameraController.CameraState prior = ctl.CaptureState();
+        int notifications = 0;
+        ctl.ModeChanged += _ =>
+        {
+            if (++notifications == 1)
+                throw new InvalidOperationException("injected camera observer failure");
+        };
+
+        Assert.Throws<InvalidOperationException>(() =>
+            ctl.EnterChaseMode(new ChaseCamera(), new RetailChaseCamera()));
+
+        ctl.RestoreState(prior);
+
+        Assert.Same(orbit, ctl.Active);
+        Assert.False(ctl.IsFlyMode);
+        Assert.False(ctl.IsChaseMode);
+        Assert.Null(ctl.Chase);
+        Assert.Null(ctl.RetailChase);
+        Assert.Equal(2, notifications);
+    }
 }