Set theme from appstate on startup

src/SharpIDE.Godot/IdeWindow.cs

@@ -2,6 +2,7 @@ using Godot;
 using Microsoft.Extensions.Hosting;
 using SharpIDE.Application.Features.Build;
 using SharpIDE.Godot.Features.IdeSettings;
+using SharpIDE.Godot.Features.Settings;
 using SharpIDE.Godot.Features.SlnPicker;
 using Environment = System.Environment;
 
@@ -32,6 +33,7 @@ public partial class IdeWindow : Control
         GodotOtelExtensions.AddServiceDefaults();
         Singletons.AppState = AppStateLoader.LoadAppStateFromConfigFile();
         GetTree().GetRoot().ContentScaleFactor = Singletons.AppState.IdeSettings.UiScale;
+        SetIdeThemeFromAppState();
         //GetWindow().SetMinSize(new Vector2I(1152, 648));
         Callable.From(() => PickSolution(true)).CallDeferred();
     }
@@ -57,6 +59,12 @@ public partial class IdeWindow : Control
         Engine.MaxFps = refreshRateBelowCapRoundedDownToInt;
     }
 
+    private void SetIdeThemeFromAppState()
+    {
+        var theme = Singletons.AppState.IdeSettings.Theme;
+        this.SetIdeTheme(theme);
+    }
+    
     public void PickSolution(bool fullscreen = false)
     {
         if (_slnPicker is not null) throw new InvalidOperationException("Solution picker is already active");