feature: add ollama models from the models dropdown

[0xN1]

Description

Add empty state to ollama models dropdown. If user don't have any models, they can add any models based on ollama list of models: https://ollama.ai/library. Handle submission and use dialog to then download the model

Why?

To simplify adding ollama models.

How to implement

• add empty state to models dropdown
• create dialog for empty state
• dialog should include link to ollama library / instruction
• create loading state when pulling/downloading model
• handle ollama model pull error
• update ollama models

Reference

• thanks @apikmeister for pointing this one out at Bug: Infinite loading on modeltypeselector for user with no ollama install on local machine #5
• https://ollama.ai/library