bug: API key check is not correct/functional

[spenceriam]

I accidentally used my PAT from GitHub in this API key check and it showed the AI models list which feels impossible if my API key wasn't valid. We need a better check once a value goes into the box to check if it's correct and if it so then show the list. If somehow the user is in the AI model selection screen AND the API key is wrong, then they should be forced back to the API screen with a message that the key is invalid