Add light/dark mode toggle to the GUI, persisted across launches

README.md

@@ -34,7 +34,8 @@ A Windows GUI wizard and a cross-platform CLI both scaffold the same project lay
   or the GUI checkbox. No credentials baked in by design — most PS4 FTP servers run anonymous.
 - **GUI wizard (Windows)** — pick a name, type, output folder, optional `.pkg` packaging, and
   optional FTP deploy target; detects your WSL distro and the OpenOrbis toolchain automatically,
-  and surfaces the latest available OpenOrbis release as a reference point.
+  and surfaces the latest available OpenOrbis release as a reference point. Light/dark mode
+  toggle, remembered across launches.
 - **VS Code integration** — generated projects include a build task (Ctrl+Shift+B) and IntelliSense
   configuration for the toolchain's unusual target triple.
 - **CLI scaffolder (Windows + Linux + WSL)** — `orbisforge new`, plus `orbisforge build`/

src/OrbisForge.Gui/GuiSettings.cs

@@ -0,0 +1,45 @@
+using System;
+using System.IO;
+
+namespace OrbisForge.Gui
+{
+    /// <summary>Tiny persisted preference store -- currently just the light/dark choice.
+    /// Not worth a full settings framework for one boolean.</summary>
+    internal static class GuiSettings
+    {
+        private static string FilePath
+        {
+            get
+            {
+                string dir = Path.Combine(
+                    Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "OrbisForge");
+                Directory.CreateDirectory(dir);
+                return Path.Combine(dir, "settings.txt");
+            }
+        }
+
+        public static bool LoadDarkMode()
+        {
+            try
+            {
+                return File.Exists(FilePath) && File.ReadAllText(FilePath).Trim() == "dark";
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        public static void SaveDarkMode(bool isDark)
+        {
+            try
+            {
+                File.WriteAllText(FilePath, isDark ? "dark" : "light");
+            }
+            catch
+            {
+                // Not worth surfacing to the user -- worst case the choice doesn't persist.
+            }
+        }
+    }
+}

src/OrbisForge.Gui/WizardForm.cs

@@ -5,6 +5,8 @@ using System.IO;
 using System.Windows.Forms;
 using UIFramework.Controls;
 using UIFramework.Core.Controls;
+using UIFramework.Core.Skinning;
+using UIFramework.Core.Skinning.Skins;
 
 using OrbisForge.Core;
 
@@ -23,6 +25,7 @@ namespace OrbisForge.Gui
         private readonly SkinLabel _envLabel = new SkinLabel();
         private readonly SkinButton _generateButton = new SkinButton();
         private readonly TextBox _statusBox = new TextBox();
+        private readonly CheckBox _darkModeCheck = new CheckBox();
 
         private WslDetectionResult _wsl;
 
@@ -42,6 +45,15 @@ namespace OrbisForge.Gui
             const int fieldWidth = 320;
             int y = 16;
 
+            _darkModeCheck.Text = "Dark mode";
+            _darkModeCheck.AutoSize = true;
+            _darkModeCheck.Anchor = AnchorStyles.Top | AnchorStyles.Right;
+            _darkModeCheck.Location = new Point(ClientSize.Width - 110, y);
+            _darkModeCheck.Checked = GuiSettings.LoadDarkMode();
+            _darkModeCheck.CheckedChanged += (s, e) => ApplyTheme(_darkModeCheck.Checked, save: true);
+            root.Controls.Add(_darkModeCheck);
+            ApplyTheme(_darkModeCheck.Checked, save: false);
+
             var nameLabel = new SkinLabel { Text = "Project name:", Location = new Point(left, y), AutoSize = true };
             y += 20;
             _nameBox.Location = new Point(left, y);
@@ -140,6 +152,12 @@ namespace OrbisForge.Gui
             Shown += (s, e) => DetectEnvironment();
         }
 
+        private static void ApplyTheme(bool dark, bool save)
+        {
+            SkinManager.Current = dark ? (ISkin)new DarkSkin() : new LightSkin();
+            if (save) GuiSettings.SaveDarkMode(dark);
+        }
+
         private void UpdatePkgCheckEnabled()
         {
             bool isExe = SelectedType() == OrbisTargetType.Exe;