`gh skill install github/gh-stack` gets stuck in `? Filter skills` prompt

### Describe the bug
When running `gh skill install github/gh-stack`, pressing Enter at the interactive prompt repeatedly displays `? Filter skills` in a loop, making it impossible to proceed with the installation.

### Steps to reproduce
1. Run `gh skill install github/gh-stack`
2. Hit `` to select all
3. Hit `Enter`
4. It shows `? Filter skills` interactive prompt to appear
5. Press `Enter` again
6. It shows `Select skill(s) to install:` again. And the first entry been deselected. (See image 1)
7. I hit `Space` to select first entry. Then, hit `Enter`.
8. It goes back to `? Filter skills` again.
9. ...Infinite loop...

> image 1

Here is the video clips:

https://github.com/user-attachments/assets/e14d9cae-1f93-4cde-9b4a-ed732af0e989

### Expected behavior
The skill should be selected/installed, or standard interactive controls (e.g., Space to select, Enter to confirm) should complete the process without repeatedly looping back to the filter prompt.

### Actual behavior
It continuously reprompts `? Filter skills` upon hitting Enter and cannot proceed.

### Context / Environment
- Command: `gh skill install github/gh-stack`
- Tool: GitHub CLI (`gh`) / `gh-stack`

まず `gh skill install github/gh-stack` を再現し、`? Filter skills` プロンプト周辺の対話的な選択フローを追跡します。報告にある右矢印、Space、Enter の順序を検証し、skills を選択して Enter を押すと、フィルタープロンプトに戻らずインストールが完了することを確認します。

索引モデルが issue の本文から書いたものです。