Microsoft Store version is so old that migration from WinGet to Microsoft Store fails

### Short summary

Since GitHub is a subsidiary of Microsoft, the latest version of the Copilot App must be published to the Microsoft Store simultaneously with the desktop version.

### Affected version or release

v1.1.6

### Installation context

Switch from WinGet to Microsoft Store

### What happened?

Copilot App doesn't launch and the following error message box appears:

\[Window Title]
Update required

\[Content]
Your data was created by a newer version of this app than the one you have installed (version 1.1.6).

Please update to the latest version to continue. Your data has not been modified.

For more details, see: ($USERPROFILE)\\.copilot\\logs\\github-app.13724.log

\[Open logs folder] \[Close]

### Steps to reproduce

1. Install Copilot App via WinGet
2. Use it to save user data
3. Uninstall it
4. Re-install it via Microsoft Store
5. Launch it

### Expected behavior

The migration succeeds and you can use the latest version of Copilot App installed from Microsoft Store

### Additional context

```
PS> winget search GitHub.CopilotApp
名前 ID バージョン ソース
---------------------------------------------------
GitHub Copilot GitHub.CopilotApp 1.1.14 winget
```

```
PS> winget list XPDCK2L0R6V76J
名前 ID バージョン ソース
-------------------------------------------------
GitHub Copilot XPDCK2L0R6V76J 1.1.6 msstore
```

WinGet を介してアプリをインストールし、ユーザーデータを保存してからアンインストールし、Microsoft Store から再インストールすることで、移行を再現します。Store 版と WinGet 版を比較し、アプリが起動して移行したデータを保持できる程度に Store リリースが十分に新しいことを確認します。

索引モデルが issue の本文から書いたものです。