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

app/MindWork AI Studio/Tools/Event.cs

@@ -7,6 +7,7 @@ public enum Event
     // Common events:
     STATE_HAS_CHANGED,
     CONFIGURATION_CHANGED,
+    COLOR_THEME_CHANGED,
     
     // Update events:
     USER_SEARCH_FOR_UPDATE,

app/MindWork AI Studio/Tools/MudThemeExtensions.cs

@@ -0,0 +1,12 @@
+using AIStudio.Settings;
+
+namespace AIStudio.Tools;
+
+public static class MudThemeExtensions
+{
+    public static Palette GetCurrentPalette(this MudTheme theme, SettingsManager settingsManager) => settingsManager.IsDarkMode switch
+    {
+        true => theme.PaletteDark,
+        false => theme.PaletteLight,
+    };
+}