chore(codebase): full cleanup pass

backend/Modules/Creators/Features/ChangeEmail.cs

@@ -38,12 +38,12 @@ public class ChangeEmailHandler(
         ChangeEmailRequest request,
         CancellationToken ct)
     {
-        var creator = await context
+        Creator? creator = await context
             .Creators
             .Include(c => c.Presentation)
             .SingleOrDefaultAsync(
                 c => c.Id == request.CreatorId,
-                cancellationToken: ct);
+                ct);
 
         if (creator is null)
         {
@@ -59,9 +59,9 @@ public class ChangeEmailHandler(
         }
 
         creator.Presentation.Email = request.Email?.Trim();
-        
+
         await context.SaveChangesAsync(ct);
-        
+
         await SendOkAsync(ct);
     }
-} 
+}