Added color themes (dark & light) (#148)

app/MindWork AI Studio/Settings/ConfigurationSelectData.cs

@@ -170,4 +170,10 @@ public static class ConfigurationSelectDataFactory
             }
         }
     }
+    
+    public static IEnumerable<ConfigurationSelectData<Themes>> GetThemesData()
+    {
+        foreach (var theme in Enum.GetValues<Themes>())
+            yield return new(theme.GetName(), theme);
+    }
 }

app/MindWork AI Studio/Settings/DataModel/DataApp.cs

@@ -2,6 +2,11 @@ namespace AIStudio.Settings.DataModel;
 
 public sealed class DataApp
 {
+    /// <summary>
+    /// The preferred theme to use.
+    /// </summary>
+    public Themes PreferredTheme { get; set; } = Themes.SYSTEM;
+    
     /// <summary>
     /// Should we save energy? When true, we will update content streamed
     /// from the server, i.e., AI, less frequently.

app/MindWork AI Studio/Settings/DataModel/Themes.cs

@@ -0,0 +1,8 @@
+namespace AIStudio.Settings.DataModel;
+
+public enum Themes
+{
+    SYSTEM = 0,
+    LIGHT,
+    DARK,
+}

app/MindWork AI Studio/Settings/DataModel/ThemesExtensions.cs

@@ -0,0 +1,16 @@
+namespace AIStudio.Settings.DataModel;
+
+public static class ThemesExtensions
+{
+    public static string GetName(this Themes theme)
+    {
+        return theme switch
+        {
+            Themes.SYSTEM => "Synchronized with the operating system settings",
+            Themes.LIGHT => "Always use light theme",
+            Themes.DARK => "Always use dark theme",
+            
+            _ => "Unknown setting",
+        };
+    }
+}

app/MindWork AI Studio/Settings/SettingsManager.cs

@@ -21,7 +21,7 @@ public sealed class SettingsManager(ILogger<SettingsManager> logger)
         Converters = { new JsonStringEnumConverter() },
     };
 
-    private ILogger<SettingsManager> logger = logger;
+    private readonly ILogger<SettingsManager> logger = logger;
     
     /// <summary>
     /// The directory where the configuration files are stored.
@@ -33,6 +33,11 @@ public sealed class SettingsManager(ILogger<SettingsManager> logger)
     /// </summary>
     public static string? DataDirectory { get; set; }
 
+    /// <summary>
+    /// Whether the app is in dark mode.
+    /// </summary>
+    public bool IsDarkMode { get; set; }
+
     /// <summary>
     /// The configuration data.
     /// </summary>