[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)

首先追蹤 TUI 對已佇列項目的滑鼠點擊處理，以及 prompt 編輯路徑。驗證 issue 中描述的工作流程：點擊一則已佇列的訊息會開啟該訊息以供編輯，並允許將其移除或重新佇列到原本的位置。

由索引模型根據 Issue 內容生成。