feat: add theme mode support with AppThemeMode enum and AppThemeState service

- Introduced AppThemeMode enum to define theme options: System, Light, Dark.
- Updated AppSettingsDocument to include ThemeMode property.
- Created AppThemeState service to manage current theme mode and handle changes.
- Integrated theme mode handling in CouchbaseLiteAppSettingsService for persistence.
- Added JavaScript for theme management in the frontend, supporting system preference detection.
- Enhanced CSS with theme variables for consistent styling across light and dark modes.
- Updated Playwright tests to ensure sidebar functionality and responsiveness.

Program.cs

@@ -19,6 +19,17 @@ using WorkTracker.Services.WorkDays;
 
 var builder = WebApplication.CreateBuilder(args);
 
+var runningInContainer = string.Equals(
+    Environment.GetEnvironmentVariable("DOTNET_RUNNING_IN_CONTAINER"),
+    "true",
+    StringComparison.OrdinalIgnoreCase)
+    || File.Exists("/.dockerenv");
+
+if (!runningInContainer)
+{
+    builder.WebHost.UseStaticWebAssets();
+}
+
 builder.Logging.ClearProviders();
 builder.Host.UseNLog();
 
@@ -60,6 +71,7 @@ builder.Services.Configure<SingleUserOptions>(builder.Configuration.GetSection(S
 
 builder.Services.AddSingleton<CouchbaseLiteDatabaseProvider>();
 builder.Services.AddScoped<IAppSettingsService, CouchbaseLiteAppSettingsService>();
+builder.Services.AddScoped<AppThemeState>();
 builder.Services.AddSingleton<IAuthService, CouchbaseLiteAuthService>();
 builder.Services.AddSingleton<IItalianFestivitySource, ItalianFestivitySource>();
 builder.Services.AddScoped<IWorkDayService, CouchbaseLiteWorkDayService>();