refactor(camera): extract the update frame

Move fly/chase publication, combat target tracking, and local player projection behind typed runtime owners. Preserve the inbound-created projection/reconcile barrier while removing GameWindow callbacks and duplicate shadow helpers.

tests/AcDream.App.Tests/Combat/CombatCameraTargetSourceTests.cs

@@ -0,0 +1,69 @@
+using System.Numerics;
+using AcDream.App.Combat;
+using AcDream.App.Interaction;
+using AcDream.Core.Combat;
+using AcDream.Core.Selection;
+
+namespace AcDream.App.Tests.Combat;
+
+public sealed class CombatCameraTargetSourceTests
+{
+    [Fact]
+    public void GetTrackedTargetPoint_RequiresOptionTargetedModeAndSelection()
+    {
+        const uint target = 0x70000001u;
+        Vector3 point = new(10f, 20f, 30f);
+        var settings = new GameplaySettingsState();
+        var combat = new CombatState();
+        var selection = new SelectionState();
+        var world = new TargetQuery(point);
+        var source = new CombatCameraTargetSource(
+            settings,
+            combat,
+            selection,
+            world);
+
+        Assert.Null(source.GetTrackedTargetPoint());
+
+        settings.Value = settings.Value with { ViewCombatTarget = true };
+        combat.SetCombatMode(CombatMode.Melee);
+        selection.Select(target, SelectionChangeSource.World);
+
+        Assert.Equal(point, source.GetTrackedTargetPoint());
+        Assert.Equal(target, world.LastGuid);
+
+        combat.SetCombatMode(CombatMode.Magic);
+        Assert.Null(source.GetTrackedTargetPoint());
+    }
+
+    private sealed class TargetQuery(Vector3 point) : IWorldSelectionQuery
+    {
+        public uint LastGuid { get; private set; }
+        public Vector3? GetCombatCameraTargetPoint(uint serverGuid)
+        {
+            LastGuid = serverGuid;
+            return point;
+        }
+
+        public uint? PickAtCursor(bool includeSelf) => null;
+        public uint? PickAt(float mouseX, float mouseY, bool includeSelf) => null;
+        public void BeginLightingPulse(uint serverGuid) { }
+        public bool TryCaptureIdentity(uint serverGuid, out uint localEntityId)
+        {
+            localEntityId = 0;
+            return false;
+        }
+        public bool IsCurrent(uint serverGuid, uint localEntityId) => false;
+        public string Describe(uint serverGuid) => string.Empty;
+        public bool IsCreature(uint serverGuid) => false;
+        public bool IsHostileMonster(uint serverGuid) => false;
+        public ClosestCombatTarget? FindClosestHostileMonster() => null;
+        public bool IsUseable(uint serverGuid) => false;
+        public bool IsPickupable(uint serverGuid) => false;
+        public bool TryGetApproach(uint serverGuid, out InteractionApproach approach)
+        {
+            approach = default;
+            return false;
+        }
+    }
+}

tests/AcDream.App.Tests/Combat/LiveCombatAttackOperationsTests.cs

@@ -120,6 +120,7 @@ public sealed class LiveCombatAttackOperationsTests
     {
         public bool AutoTarget { get; set; }
         public bool AutoRepeatAttack { get; set; }
+        public bool ViewCombatTarget { get; set; }
     }
 
     private sealed class FakeLiveSource : ILiveInWorldSource, ILiveWorldSessionSource