Implements a dark mode override system for DevExpress Blazor themes lacking native dark support. Adds a JS function to toggle a dx-dark class on <html>, updates ThemeState to detect native dark themes, and applies targeted CSS variable overrides for consistent dark styling. Disables prerendering to ensure JS interop, and improves theme switching logic and documentation.
Wrapped the Dark Mode toggle button in a span with left margin
for better separation from the theme combo box. Added a new
.btn-gap CSS class to standardize button spacing in the top row.
Introduce a DxComboBox in MainLayout for selecting between multiple themes. Update ThemeState to manage the current theme, provide a list of available themes, and apply the selected theme via a new SetTheme method. Refactor dark mode handling to work with the new theme system, and ensure UI updates on theme or mode changes.
Implement dark mode support using a new ThemeState service that manages theme switching and integrates with DevExpress Blazor theming. Update App.razor to apply the theme globally, enhance MainLayout with a toggle button and dynamic CSS classes, and add dark mode styles to CSS files. Register ThemeState as a scoped service in Program.cs.
Added new Blazor Server project `DbFirst.BlazorWebApp` with core UI components, pages, and static assets. Updated solution file to include the project. Also added `bootstrap.min.css.map` to support CSS debugging in browser developer tools.
