Suggest updated models to replace old favourites

Currently, when new model versions release, users must manually unfavourite outdated models and favourite the new ones. This is repetitive and easy to forget.

Proposed Solution: Add a subtle update indicator to the model selector that surfaces when newer versions are available.

UI Placement: A button with an update icon positioned next to the filter button. Clicking it reveals a checklist of updatable models with checkboxes to select which ones to update in the list.

This keeps the interface clean while making the update path discoverable without being pushy.