chore(codebase): full cleanup pass

backend/Modules/Creators/Features/ChangeBanner.cs

@@ -29,11 +29,11 @@ public static class ChangeBanner
             Request request,
             CancellationToken ct)
         {
-            var creator = await context
+            Creator? creator = await context
                 .Creators
                 .SingleOrDefaultAsync(
                     c => c.Id == request.CreatorId,
-                    cancellationToken: ct);
+                    ct);
 
             if (creator is null)
             {
@@ -41,7 +41,7 @@ public static class ChangeBanner
                 return;
             }
 
-            var blobUrl = await blobStorage.UploadFileAsync(
+            string blobUrl = await blobStorage.UploadFileAsync(
                 ContainerNames.Creators,
                 $"{request.CreatorId}/{SubDirectoryNames.Profile}/{CommonFileNames.BannerPicture}",
                 request.File.OpenReadStream(),