[TUI] Ability to click on enqueued entry to edit it

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

It's hard to know how to adjust already enqueued message, clicking doesn't work

### Proposed solution

The TUI generally understands mouse clicks for bunch of stuff. Clicking enqueued message to adjust it isn't one of these. Support it.

### Example prompts or workflows

_No response_

### Additional context

- Enqueue a message
- Click on the enqueued entry

Expected:
Enqueued message moves to prompt edit, allows you to adjust it, remove, re-enqueue (at original position)

Start by tracing the TUI's mouse-click handling for enqueued entries and the prompt-editing path. Verify the workflow described in the issue: clicking an enqueued message opens it for editing and permits removal or re-enqueueing at its original position.

Written by the indexing model from the issue text.