enhancement: Selecting session history workflow

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# Feature Request: Selecting Session History Quality of Life Improvement

## Description

When opening chat history, the focus should automatically shift to the sessions section. Upon selecting a session, the focus should return to the input area and optionally close the sessions list.

### Current Flow

1. Open the sessions panel
2. Navigate through the output panel to the session panel
3. Navigate back to the input
4. Close the session panel

This process is unnecessarily long and cumbersome.

### Proposed Improvement

- **Automatic Focus**: When opening chat history, the focus should automatically be on the sessions panel.
- **Refocus on Input**: After selecting a session, the focus should return to the input area.
- **Optional Closure**: Optionally, the sessions list should close after a session is selected.

This improvement aims to streamline the process and enhance user experience.

No files or tests are named. Locate the chat history entry point, sessions panel, session-selection handler, and input focus handling; done means opening history focuses the sessions panel, selecting a session returns focus to the input, and the list can optionally close.

Written by the indexing model from the issue text.