[FEATURE] Prefetch model list from Ollama

[Jawahars]

Describe the feature you'd like

Enhancement Proposal: Prefetch Local Models for Model Name Input
Current Behavior:
The model name is a free-text textbox, which can lead to errors if an incorrect name is entered.

Proposed Change:
Fetch the list of locally available models using the Ollama API. Use this list to:

Autofill suggestions in the textbox, or
Replace the textbox with a dropdown of available models.

Benefits:

Prevents incorrect model names.
Improves user experience.
Fallback: If the API call fails, retain the current free-text behavior with a warning.

Additional context

List model API defined by Ollama - https://github.com/ollama/ollama/blob/main/docs/api.md#list-local-models