It should be easy to create new session out of /btw

### Describe the feature or problem you'd like to solve

Allow one shortcut (shown as hint) creation of a new session out of /btw ask

### Proposed solution

_No response_

### Example prompts or workflows

1. /btw
2. Get answer in the popup "window" on the bottom
3.
4. -> new session

### Additional context

_No response_

No files or tests are named. Start by tracing how /btw displays its popup and how the CLI creates a new session; identify the existing keyboard shortcut or hint mechanism. Done means a user can discover the shortcut from the /btw popup and start the ask as a new session.

Rédigé par le modèle d'indexation à partir du texte de l'issue.