Добавьте файлы проекта.

PlaylistShared.Pwa/Services/ApiClient.cs

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+using PlaylistShared.Shared.DTO;
+using System.Net.Http.Json;
+
+namespace PlaylistShared.Pwa.Services;
+
+public class ApiClient
+{
+    private readonly HttpClient _http;
+
+    public ApiClient(HttpClient http) => _http = http;
+
+    public async Task<LoginResponse?> RefreshTokenAsync(string? refreshToken)
+    {
+        var response = await _http.PostAsJsonAsync("/api/account/refresh-token", new RefreshTokenRequest { RefreshToken = refreshToken });
+        if (!response.IsSuccessStatusCode) return null;
+        var apiResponse = await response.Content.ReadFromJsonAsync<ApiResponse<LoginResponse>>();
+        return apiResponse?.Data;
+    }
+}