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>

src/AcDream.App/Input/LocalPlayerRuntimeState.cs

@@ -1,4 +1,5 @@
 using AcDream.Core.Physics;
+using AcDream.App.Physics;
 
 namespace AcDream.App.Input;
 
@@ -29,6 +30,20 @@ internal sealed class LocalPlayerControllerSlot : ILocalPlayerControllerSource
     public PlayerMovementController? Controller { get; set; }
 }
 
+internal interface ILocalPlayerPhysicsHostSource
+{
+    EntityPhysicsHost? Host { get; }
+}
+
+/// <summary>
+/// The one mutable local physics-host slot. Player-mode lifecycle owns
+/// assignment; teleport and update owners receive the read-only seam.
+/// </summary>
+internal sealed class LocalPlayerPhysicsHostSlot : ILocalPlayerPhysicsHostSource
+{
+    public EntityPhysicsHost? Host { get; set; }
+}
+
 internal interface ILocalPlayerModeSource
 {
     bool IsPlayerMode { get; }
@@ -50,3 +65,59 @@ internal sealed class LocalPlayerModeState : ILocalPlayerModeSource
         ChaseModeEverEntered = false;
     }
 }
+
+/// <summary>
+/// Session-scoped server-authoritative movement skills. Player-description
+/// delivery and player-mode construction share this owner so rebuilding the
+/// local physics controller cannot fall back to stale defaults.
+/// </summary>
+internal sealed class LocalPlayerSkillState
+{
+    public int RunSkill { get; private set; } = -1;
+    public int JumpSkill { get; private set; } = -1;
+    public bool IsComplete => RunSkill >= 0 && JumpSkill >= 0;
+
+    public void Update(
+        int runSkill,
+        int jumpSkill,
+        PlayerMovementController? controller)
+    {
+        if (runSkill >= 0)
+            RunSkill = runSkill;
+        if (jumpSkill >= 0)
+            JumpSkill = jumpSkill;
+        ApplyTo(controller);
+    }
+
+    public bool ApplyTo(PlayerMovementController? controller)
+    {
+        if (controller is null || !IsComplete)
+            return false;
+
+        controller.SetCharacterSkills(RunSkill, JumpSkill);
+        return true;
+    }
+
+    public void ResetSession()
+    {
+        RunSkill = -1;
+        JumpSkill = -1;
+    }
+}
+
+internal interface IViewportAspectSource
+{
+    float Aspect { get; }
+}
+
+/// <summary>Framebuffer aspect published by the window host.</summary>
+internal sealed class ViewportAspectState : IViewportAspectSource
+{
+    public float Aspect { get; private set; } = 16f / 9f;
+
+    public void Update(int width, int height)
+    {
+        if (width > 0 && height > 0)
+            Aspect = width / (float)height;
+    }
+}