Decoupling chat and FIM in the dashboard

### Describe the issue

Usually, FIM doesn't have any answer so we should decoupling the experience from chat

### Steps to Reproduce

Try FIM

### Operating System

Microsoft Windows (Intel)

### IDE and Version

latest

### Extension and Version

any

### Provider

Anthropic

### Model

any

### Codegate version

any

### Logs

_No response_

### Additional Context

_No response_