Correct website creation limits for all subscription plans

We discovered that the system was still using old plan names to determine how many websites you could create. This caused some users, especially on the Growth plan, to face tighter limits than expected, allowing only one site instead of three.

**Fair limits for everyone**
We've updated the website creation process to rely on a centralized way of checking plan limits, which understands both the new and old plan types. This means your plan’s website creation limits now apply correctly, so you get the full benefit of your subscription without any unexpected barriers.

Thank you for your patience as we iron out these kinks — building the right features includes making sure access and limits behave as they should.