Refactor NavMenu to use DevExpress DxTreeView for navigation, replacing the old NavLink-based menu. Update sidebar and navigation row styling to use CSS variables, remove Bootstrap-specific and SVG icon CSS, and add a responsive hamburger menu for small screens. Improve dark mode support and overall maintainability.
Replaced icons for "Catalogs", "Dashboards", and "MassData" in NavMenu.razor with new custom Bootstrap-style SVG icons. Added corresponding CSS classes using data URIs to embed the new white icons, ensuring consistent appearance in the navigation menu.
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.
