--webcontent caching account/sessions between dialog instances

[philipross]

Describe the bug
When running a dialog with --webcontent using a website that requires login, the user session/account details are cached between instances of running dialog.

To Reproduce
Steps to reproduce the behavior:

1. Run: dialog --title none --message none --icon none --ontop --webcontent https://mail.google.com
2. Sign into your GMail account within the dialog window
3. Close the dialog box
4. Re-run a new dialog, either with the same --webcontent or with a different URL - e.g.: --webcontent https://sheets.google.com
5. Dialog will launch with your account signed in.

Expected behavior
I would expect that the webview runs like an incognito/private browsing mode so that it doesn't cache credentials/user details when using --webcontent

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• macOS version 15.0 RC1
• swiftDialog version 2.5.1.4775 and also 2.5.2.4777

Additional context
This also happens if I run a second dialog from a brand new terminal session.

[bartreardon]

yeah, that's not how the behaviour of WKWebsiteDataStore.nonPersistent() configuration is supposed to work:

nonPersistent()
Creates a new data store object that stores website data in memory, and doesn’t write that data to disk.

Yet information about the session not only persists between dialogs but also after a reboot, so it's being written somewhere.