Remove Extensions class and update namespace references from Helpers to Helper for consistency

Helper/AuthHelper.cs

@@ -2,7 +2,7 @@ using System.Text.Json;
 using System.Text.Json.Nodes;
 using FsToolbox.Cli.Tasks;
 
-namespace FsToolbox.Cli.Helpers
+namespace FsToolbox.Cli.Helper
 {
     /// <summary>
     ///     Provides helper methods to manage authentication and cached CSRF tokens.

Helper/Extensions.cs

@@ -1,41 +0,0 @@
-using System.Text;
-using System.Text.Json.Nodes;
-
-namespace FsToolbox.Cli.Helpers
-{
-    public static class Extensions
-    {
-        #region Public Method FsPostAsync
-
-        /// <summary>
-        ///     Sends a POST request to the specified URI with the provided JSON content.
-        /// </summary>
-        /// <param name="httpClient">The instance of <see cref="HttpClient" /> used to send the request.</param>
-        /// <param name="requestUri">The URI to which the request is sent.</param>
-        /// <param name="jsonObject">The JSON object to include in the request body.</param>
-        /// <returns>A task that represents the asynchronous operation. The task result contains the HTTP response.</returns>
-        public static async Task<HttpResponseMessage> FsPostAsync(this HttpClient httpClient, string requestUri, JsonObject jsonObject)
-        {
-            var content = new StringContent(jsonObject.ToString(), Encoding.UTF8, "application/json");
-            content.Headers.ContentType = new("application/json");
-            return await httpClient.PostAsync(requestUri, content);
-        }
-
-        #endregion
-
-        #region Public Method ToList
-
-        /// <summary>
-        ///     Converts the specified JSON node into a list of non-null <see cref="JsonNode" /> elements.
-        /// </summary>
-        /// <param name="node">The <see cref="JsonNode" /> to be converted. If null, an empty list is returned.</param>
-        /// <returns>A list of <see cref="JsonNode" /> instances containing non-null elements.</returns>
-        public static List<JsonNode> ToList(this JsonNode? node)
-        {
-            var array = node?.AsArray() ?? [];
-            return array.Where(x => x != null).Select(x => x!).ToList();
-        }
-
-        #endregion
-    }
-}

Helper/Settings.cs

@@ -1,6 +1,6 @@
 using Microsoft.Extensions.Configuration;
 
-namespace FsToolbox.Cli.Helpers
+namespace FsToolbox.Cli.Helper
 {
     /// <summary>
     ///     Represents the root configuration settings for the application, including API and credentials.