Introduced `ThemeService` to manage themes and dark mode, with a new footer UI for theme selection and toggling dark mode. Added dynamic CSS loading and Bootstrap theme support. Registered `UserPreferencesService` and `ThemeService` for SSR compatibility. Removed hardcoded DevExpress theme links.
Fixed German localization issues in `LoginReceiverPage` and `LoginSenderPage`. Updated `app.css` with styles for the new footer controls. Simplified font loading in `MainLayout.razor`.
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