Added dependency injection for `CultureService` in `App.razor` to dynamically initialize culture settings during the component's lifecycle.
Included `System.Globalization` and `EnvelopeGenerator.ReceiverUI.Services` namespaces to support culture-related functionality.
Injected `CultureService` and added an `OnInitializedAsync` method to set `CultureInfo.DefaultThreadCurrentCulture` and `CultureInfo.DefaultThreadCurrentUICulture` based on the service's initialization.
Reformatted surrounding `<Router>` code for clarity.
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