Better model selector UX

[OvercomeMH]

Contingent on user being on the far leftmost carrot position, or already on the drop-down for selecting a given model, pressing left should let user choose between model providers.

Presently there is no obvious way to do this without clicking.

I think you should also be able to reorder favorites by dragging and dropping. Presently I think you have to delete favourites and re add them to get the order you want?