[FEATURE]: Do not automatically activate new models #13164

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

It would be great if new models were not automatically activated in OpenCode Desktop, and possibly also in CLI, provided that the behavior is identical there, so that you only ever see the models that you have manually activated for this view in the productive model selection. Otherwise, models that you don't actually want to work with keep popping up there.