feat(ui): persist retained window layouts

tests/AcDream.App.Tests/UI/Layout/ChatLayoutConformanceTests.cs

@@ -180,8 +180,9 @@ public class ChatLayoutConformanceTests
         maxMin.OnClick!();
 
         Assert.True(controller.IsMaximized);
-        Assert.Equal(90f, handle.Top);
+        Assert.Equal(130f, handle.Top);
         Assert.Equal(370f, handle.Height); // DAT max 360 + 2*5px shared chrome
+        Assert.Equal(500f, handle.Top + handle.Height); // lower edge stays fixed while growing upward
         Assert.Equal(RetailUiStateIds.Maximized, maxMin.ActiveRetailStateId);
         controller.Root.ApplyAnchor(handle.Width, handle.Height);
         Assert.Equal(360f, controller.Root.Height);

tests/AcDream.App.Tests/UI/Layout/RetailWindowFrameTests.cs

@@ -106,6 +106,59 @@ public sealed class RetailWindowFrameTests
         Assert.False(content.Resizable);
     }
 
+    [Fact]
+    public void HiddenInventory_RestoredExpandedBeforeFirstDraw_GrowsContentsRows()
+    {
+        ImportedLayout layout = FixtureLoader.LoadInventory();
+        UiItemList grid = Assert.IsType<UiItemList>(
+            layout.FindElement(InventoryController.ContentsGridId));
+        grid.Columns = 6;
+        grid.CellWidth = 32f;
+        grid.CellHeight = 32f;
+        grid.Flush();
+        for (int i = 0; i < 102; i++)
+            grid.AddItem(new UiItemSlot());
+
+        var root = new UiRoot { Width = 1280, Height = 720 };
+        RetailWindowHandle handle = RetailWindowFrame.Mount(
+            root,
+            layout.Root,
+            NoTex,
+            new RetailWindowFrame.Options
+            {
+                WindowName = WindowNames.Inventory,
+                Chrome = RetailWindowChrome.NineSlice,
+                ContentWidth = layout.Root.Width,
+                ContentHeight = layout.Root.Height,
+                Visible = false,
+                ResizeX = false,
+                ResizeY = true,
+                ResizableEdges = ResizeEdges.Bottom,
+                MaxHeight = 560f,
+            });
+
+        // Production installs the controller-owned policies after mounting, while
+        // inventory is still hidden, and captures their design baseline immediately.
+        InventoryController.ConfigureResizeLayout(layout);
+
+        // Persistence restores the hidden window before its first visible draw.
+        handle.ResizeTo(handle.Width, 527f);
+        ApplyAnchors(handle.OuterFrame);
+        grid.LayoutCells();
+
+        Assert.Equal(251f, grid.Height);
+        Assert.Equal(42, grid.Children.Count(child => child.Visible));
+    }
+
+    private static void ApplyAnchors(UiElement parent)
+    {
+        foreach (UiElement child in parent.Children)
+        {
+            child.ApplyAnchor(parent.Width, parent.Height);
+            ApplyAnchors(child);
+        }
+    }
+
     private static ElementInfo Constraints(int minHeight, int maxHeight)
     {
         var info = new ElementInfo();

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

@@ -0,0 +1,102 @@
+using AcDream.App.UI;
+using AcDream.UI.Abstractions.Panels.Settings;
+
+namespace AcDream.App.Tests.UI;
+
+public sealed class RetailWindowLayoutPersistenceTests : IDisposable
+{
+    private readonly string _directory = Path.Combine(
+        Path.GetTempPath(), "acdream-window-layout-tests-" + Guid.NewGuid().ToString("N"));
+    private string PathName => Path.Combine(_directory, "settings.json");
+
+    [Fact]
+    public void CompletedInteractions_SaveCompleteCharacterResolutionLayout()
+    {
+        var store = new SettingsStore(PathName);
+        var root = new UiRoot { Width = 800, Height = 600 };
+        RetailWindowHandle handle = Mount(root, "chat");
+        using var persistence = new RetailWindowLayoutPersistence(
+            root.WindowManager, store, () => "Alice", () => (800, 600));
+
+        handle.MoveTo(44f, 55f);
+        handle.ResizeTo(320f, 180f);
+        handle.Hide();
+
+        UiWindowLayout saved = Assert.IsType<UiWindowLayout>(
+            store.LoadWindowLayout("Alice", "800x600", "chat", default));
+        Assert.Equal((44f, 55f, 320f, 180f), (saved.X, saved.Y, saved.Width, saved.Height));
+        Assert.False(saved.Visible);
+    }
+
+    [Fact]
+    public void Restore_ClampsBoundsAndReappliesPanelStateAndVisibility()
+    {
+        var store = new SettingsStore(PathName);
+        store.SaveWindowLayout(
+            "Alice",
+            "640x480",
+            "chat",
+            new UiWindowLayout(900f, 700f, 500f, 300f, false, false, true));
+
+        var root = new UiRoot { Width = 640, Height = 480 };
+        var state = new FakeWindowState();
+        RetailWindowHandle handle = Mount(root, "chat", state);
+        using var persistence = new RetailWindowLayoutPersistence(
+            root.WindowManager, store, () => "Alice", () => (640, 480));
+
+        persistence.RestoreAll();
+
+        Assert.Equal((500f, 300f), (handle.Width, handle.Height));
+        Assert.Equal((140f, 180f), (handle.Left, handle.Top));
+        Assert.False(handle.IsVisible);
+        Assert.True(state.Restored.Maximized);
+    }
+
+    [Fact]
+    public void DefaultPreLoginKey_NeverOverwritesCharacterLayouts()
+    {
+        var store = new SettingsStore(PathName);
+        var root = new UiRoot { Width = 800, Height = 600 };
+        RetailWindowHandle handle = Mount(root, "radar");
+        using var persistence = new RetailWindowLayoutPersistence(
+            root.WindowManager, store, () => "default", () => (800, 600));
+
+        handle.MoveTo(123f, 234f);
+
+        Assert.Null(store.LoadWindowLayout("default", "800x600", "radar", default));
+    }
+
+    private static RetailWindowHandle Mount(
+        UiRoot root,
+        string name,
+        IRetainedWindowStateController? state = null)
+    {
+        var frame = new UiPanel
+        {
+            Left = 10f,
+            Top = 20f,
+            Width = 200f,
+            Height = 100f,
+            MinWidth = 100f,
+            MinHeight = 80f,
+            MaxWidth = 600f,
+            MaxHeight = 400f,
+            Draggable = true,
+            Resizable = true,
+        };
+        root.AddChild(frame);
+        return root.RegisterWindow(name, frame, stateController: state);
+    }
+
+    public void Dispose()
+    {
+        if (Directory.Exists(_directory)) Directory.Delete(_directory, recursive: true);
+    }
+
+    private sealed class FakeWindowState : IRetainedWindowStateController
+    {
+        public RetainedWindowState Restored { get; private set; }
+        public RetainedWindowState CaptureWindowState() => Restored;
+        public void RestoreWindowState(RetainedWindowState state) => Restored = state;
+    }
+}