Fixed the system theme overriding a fixed color theme

app/MindWork AI Studio/Layout/MainLayout.razor

@@ -102,4 +102,4 @@
     </MudLayout>
 </MudPaper>
 
-<MudThemeProvider @ref="@this.themeProvider" Theme="@this.ColorTheme" IsDarkMode="@this.useDarkMode" />
+<MudThemeProvider @ref="@this.themeProvider" Theme="@this.ColorTheme" IsDarkMode="@this.useDarkMode" ObserveSystemThemeChange="@this.FollowSystemTheme" />

app/MindWork AI Studio/Layout/MainLayout.razor.cs

@@ -144,7 +144,7 @@ public partial class MainLayout : LayoutComponentBase, IMessageBusReceiver, ILan
         // Send a message to start the plugin system:
         await this.MessageBus.SendMessage<bool>(this, Event.STARTUP_PLUGIN_SYSTEM);
         
-        await this.themeProvider.WatchSystemDarkModeAsync(this.SystemeThemeChanged);
+        await this.themeProvider.WatchSystemDarkModeAsync(this.SystemThemeChanged);
         await this.UpdateThemeConfiguration();
         this.LoadNavItems();
         this.LoadEmbeddingItem();
@@ -564,19 +564,28 @@ public partial class MainLayout : LayoutComponentBase, IMessageBusReceiver, ILan
         }
     }
     
-    private async Task SystemeThemeChanged(bool isDark)
+    /// <summary>
+    /// True, when the user wants AI Studio to follow the light or dark mode of the operating system.
+    /// </summary>
+    /// <remarks>
+    /// This also decides whether the MudThemeProvider watches the operating system at all. On a system
+    /// change, the provider takes the new mode into its own state first and calls our handler only
+    /// afterward, so the handler cannot prevent it. Nor can a new render of this layout undo it: the
+    /// provider takes over its IsDarkMode parameter only when that value changes, and with a fixed theme,
+    /// it never does. Were the provider watching while the user chose a fixed theme, MudBlazor would show
+    /// the colors of the system from the next render on, while the rest of the app kept the chosen ones.
+    /// </remarks>
+    private bool FollowSystemTheme => this.SettingsManager.ConfigurationData.App.PreferredTheme is Themes.SYSTEM;
+
+    private async Task SystemThemeChanged(bool isDark)
     {
         this.Logger.LogInformation($"The system theme changed to {(isDark ? "dark" : "light")}.");
-
-        if (this.SettingsManager.ConfigurationData.App.PreferredTheme is not Themes.SYSTEM)
-            return;
-
         await this.UpdateThemeConfiguration();
     }
 
     private async Task UpdateThemeConfiguration()
     {
-        if (this.SettingsManager.ConfigurationData.App.PreferredTheme is Themes.SYSTEM)
+        if (this.FollowSystemTheme)
             this.useDarkMode = await this.themeProvider.GetSystemDarkModeAsync();
         else
             this.useDarkMode = this.SettingsManager.ConfigurationData.App.PreferredTheme == Themes.DARK;