Refactor: Make GetClientAccessTokenAsync private and awaitable

Changed the GetClientAccessTokenAsync method from public to private as it does not need to be openly available. This method is now properly awaited in all calls to ensure sequential execution and prevent potential issues related to concurrency or incomplete tasks.

FoliCon/Modules/DeviantArt/DArt.cs

@@ -52,7 +52,7 @@ public static async Task<DArt> GetInstanceAsync(string clientSecret, string clie
         return dArt;
     }
 
-    public async Task GetClientAccessTokenAsync()
+    private async Task GetClientAccessTokenAsync()
     {
         if (!_cache.TryGetValue("DArtToken", out string cachedToken))
         {
@@ -93,7 +93,7 @@ private async Task<string> GenerateNewAccessToken()
 
     public async Task<DArtBrowseResult> Browse(string query, int offset = 0)
     {
-        GetClientAccessTokenAsync();
+        await GetClientAccessTokenAsync();
 
         var url = GetBrowseApiUrl(query, offset);
         using var response = await Services.HttpC.GetAsync(new Uri(url));
@@ -111,7 +111,7 @@ public async Task<DArtBrowseResult> Browse(string query, int offset = 0)
     /// <returns>The DArtDownloadResponse object containing the download details.</returns>
     public async Task<DArtDownloadResponse> Download(string deviationId)
     {
-        GetClientAccessTokenAsync();
+        await GetClientAccessTokenAsync();
         var dArtDownloadResponse = await GetDArtDownloadResponseAsync(deviationId);
         await TryExtraction(deviationId, dArtDownloadResponse, CancellationToken.None, new Progress<ProgressInfo>(_ => { }));
 
@@ -144,7 +144,7 @@ public async Task<DArtDownloadResponse> ExtractDeviation(string deviationId,
         DArtDownloadResponse dArtDownloadResponse, CancellationToken cancellationToken,
         IProgress<ProgressInfo> progressCallback)
     {
-        GetClientAccessTokenAsync();
+        await GetClientAccessTokenAsync();
         return await TryExtraction(deviationId, dArtDownloadResponse, cancellationToken, progressCallback);
 
     }