Вытащил солюшен на уровень выше, чтобы прощё было дотнетить

BlazorWebAssemblyVisaApiClient/Infrastructure/Services/DateTimeProvider/DateTimeProvider.cs

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+namespace BlazorWebAssemblyVisaApiClient.Infrastructure.Services.DateTimeProvider;
+
+public class DateTimeProvider : IDateTimeProvider
+{
+    public DateTime Now() => DateTime.Now;
+
+    public string FormattedNow() => Now().ToString("yyyy-MM-dd");
+}

BlazorWebAssemblyVisaApiClient/Infrastructure/Services/DateTimeProvider/IDateTimeProvider.cs

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+namespace BlazorWebAssemblyVisaApiClient.Infrastructure.Services.DateTimeProvider;
+
+public interface IDateTimeProvider
+{
+    DateTime Now();
+
+    string FormattedNow();
+}

BlazorWebAssemblyVisaApiClient/Infrastructure/Services/UserDataProvider/Exceptions/UnknownRoleException.cs

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+using BlazorWebAssemblyVisaApiClient.Common.Exceptions;
+
+namespace BlazorWebAssemblyVisaApiClient.Infrastructure.Services.UserDataProvider.Exceptions;
+
+public class UnknownRoleException() : BlazorClientException("Unknown user role");

BlazorWebAssemblyVisaApiClient/Infrastructure/Services/UserDataProvider/IUserDataProvider.cs

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+using VisaApiClient;
+
+namespace BlazorWebAssemblyVisaApiClient.Infrastructure.Services.UserDataProvider;
+
+public interface IUserDataProvider
+{
+    public string? CurrentRole { get; }
+
+    public Action? OnRoleChanged { get; set; }
+
+    public Task<ApplicantModel> GetApplicant();
+
+    public void UpdateCurrentRole();
+}

BlazorWebAssemblyVisaApiClient/Infrastructure/Services/UserDataProvider/UserDataProvider.cs

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+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using BlazorWebAssemblyVisaApiClient.Infrastructure.Services.UserDataProvider.Exceptions;
+using VisaApiClient;
+
+namespace BlazorWebAssemblyVisaApiClient.Infrastructure.Services.UserDataProvider;
+
+public class UserDataProvider(IClient client) : IUserDataProvider
+{
+    private readonly static JwtSecurityTokenHandler tokenHandler = new();
+
+    public string? CurrentRole { get; private set; }
+
+    public Action? OnRoleChanged { get; set; }
+
+    public async Task<ApplicantModel> GetApplicant()
+    {
+            return await client.GetApplicantAsync();
+        }
+
+    public void UpdateCurrentRole()
+    {
+            var role = CurrentRole;
+
+            if (client.AuthToken is null)
+            {
+                if (CurrentRole is not null)
+                {
+                    role = null;
+                }
+            }
+            else
+            {
+                var token = tokenHandler.ReadJwtToken(client.AuthToken.Token);
+                role = token.Claims.FirstOrDefault(claim => claim.Type == ClaimTypes.Role)?.Value;
+
+                switch (role)
+                {
+                    case Constants.ApplicantRole: break;
+                    case Constants.ApprovingAuthorityRole: break;
+                    case Constants.AdminRole: break;
+                    default: throw new UnknownRoleException();
+                }
+            }
+
+            if (CurrentRole != role)
+            {
+                CurrentRole = role;
+                OnRoleChanged?.Invoke();
+            }
+        }
+}