Added 'Plus' AI model to Labs

We’ve created a new ‘Plus’ AI model.

This model can create larger diagrams, with less errors.

It takes 2-4 minutes to generate diagram options.

Each generation of 3 diagram options counts as 1 diagram from your plan.

This is the same approach as with the model you use today (which we have now called the ‘Core’ model).

If we release this officially, we may include it in a plan with different pricing.