Allow editing of models

[i13-ctflora]

Is your feature request related to a problem? Please describe. I cannot see all of the details about my configured models from the UI. I can't edit a model configuration through the UI if I discover a typo, but must instead delete it and re-enter it. Also, many models from the same provider use the same configuration except for the model name - it would be much easier to enter these if I could duplicate the first one entered.

Describe the solution you'd like In the 'Actions' column, add an Edit button and a Duplicate button.
Edit opens the Add Custom Embedding Model dialog with the selected model's configuration pre-populated, allowing you to see & edit the settings. Duplicate should do the same thing, but if you change the Model field, it saves as a new Model.

Describe alternatives you've considered The only alternative I can see is to manually edit the Copilot data.json file, which is prone to errors.

Additional context Add any other context or screenshots about the feature request here.