chore(codebase): full cleanup pass

backend/Modules/Memberships/Handlers/CancelMembership.cs

@@ -19,18 +19,18 @@ public class CancelMembershipHandler(
         Delete("/api/memberships");
         Options(o => o.WithTags("Memberships"));
     }
-    
+
     public override async Task HandleAsync(
         CancelMembershipRequest req,
         CancellationToken ct)
     {
-        var subscription = await dbContext
+        Membership? subscription = await dbContext
             .Memberships
             .FindAsync(
                 [req.SubscriptionId],
-                cancellationToken: ct);
+                ct);
 
-        if (subscription is not { EndDate: null } 
+        if (subscription is not { EndDate: null }
             || subscription.StripeSubscriptionId is null)
         {
             await SendNotFoundAsync(ct);