App is acting as if dialog box/modal has not been dismissed. As a result the app is useless.

### Short summary

App is acting as if dialog box/modal has not been dismissed. As a result the app is useless.

### Affected version or release

V1.0.9

### Installation context

_No response_

### What happened?

App is acting as if dialog box/modal has not been dismissed. As a result the app is useless.

Edition Windows 11 Enterprise
Version 23H2
Installed on ‎11/‎29/‎2024
OS build 22631.7219
Experience Windows Feature Experience Pack 1000.22700.1108.0

### Steps to reproduce

Asked it to Create a canvas for me, which it did. I noticed that some of the features in the HTML needed to be fixed so I asked it to fix it. From there a Copilot Desktop Dialog box let me know that the work was finished. X out of the box and the app still thinks that there is a dialog box. No matter if I kill the process its acting as if the alert has not been dismissed. If I restart, same issue.

### Expected behavior

Not to act like a dialog is there when there is no dialog.

### Additional context

_No response_

Windows 11 のバージョン 1.0.9 で、canvas を作成し、その HTML の修正を依頼し、Copilot Desktop ダイアログを閉じて、アプリを再起動することでこれを再現します。ファイルやエントリポイントは指定されていません。ダイアログを閉じた後、プロセスを終了した後、または再起動した後に、アプリがダイアログが残っているかのように振る舞わなくなれば完了です。

索引モデルが issue の本文から書いたものです。