fix #208: keep combat bar hidden in peace mode

Treat combat-window visibility as gameplay-state owned so character layout restoration cannot replay a stale visible bit. Reset combat state to NonCombat at character-session entry, matching retail ClientCombatSystem::Begin.

Co-Authored-By: Codex <codex@openai.com>

tests/AcDream.App.Tests/UI/RetailWindowLayoutPersistenceTests.cs

@@ -66,6 +66,39 @@ public sealed class RetailWindowLayoutPersistenceTests : IDisposable
         Assert.Null(store.LoadWindowLayout("default", "800x600", "radar", default));
     }
 
+    [Fact]
+    public void Restore_StateManagedWindow_PreservesAuthoritativeVisibility()
+    {
+        var store = new SettingsStore(PathName);
+        store.SaveWindowLayout(
+            "Alice",
+            "800x600",
+            "combat",
+            new UiWindowLayout(44f, 55f, 200f, 100f, true, false, false));
+
+        var root = new UiRoot { Width = 800, Height = 600 };
+        RetailWindowHandle handle = Mount(root, "combat");
+        handle.Hide();
+        using var persistence = new RetailWindowLayoutPersistence(
+            root.WindowManager,
+            store,
+            () => "Alice",
+            () => (800, 600),
+            stateManagedVisibilityWindows: ["combat"]);
+
+        persistence.RestoreAll();
+
+        Assert.Equal((44f, 55f), (handle.Left, handle.Top));
+        Assert.False(handle.IsVisible);
+
+        // Combat mode owns subsequent show/hide transitions as well; they must
+        // not turn into saved user visibility preferences.
+        handle.Show();
+        UiWindowLayout saved = Assert.IsType<UiWindowLayout>(
+            store.LoadWindowLayout("Alice", "800x600", "combat", default));
+        Assert.False(saved.Visible);
+    }
+
     private static RetailWindowHandle Mount(
         UiRoot root,
         string name,

tests/AcDream.Core.Tests/Combat/CombatStateTests.cs

@@ -128,15 +128,17 @@ public sealed class CombatStateTests
     }
 
     [Fact]
-    public void Clear_ResetsHealthCache()
+    public void Clear_ResetsCharacterSessionToPeaceMode()
     {
         var state = new CombatState();
         state.OnUpdateHealth(1, 0.5f);
         state.OnUpdateHealth(2, 0.8f);
+        state.SetCombatMode(CombatMode.Melee);
 
         state.Clear();
 
         Assert.Equal(1f, state.GetHealthPercent(1));    // back to default
         Assert.Equal(0, state.TrackedTargetCount);
+        Assert.Equal(CombatMode.NonCombat, state.CurrentMode);
     }
 }