Proposed Solution: Default to No AI Option for Cost Control

When I add an AI enrichment column it often defaults to GPT 4o rather than a cheaper alternative such as GPT 4o mini. This has sometimes meant I accrue large API costs if I forget to change it over. This is something that didnt happen before so unsure if this was a recent change. I'm wondering if it can by default not select anything and force the user to choose one of the options so that this issue does not come up again.