Use persistent permissions when accessing a local directory

[adamziel]

Playground enables loading a local WordPress site in the browser. Unfortunately, the user may be asked to grant directory permissions on each visit. Chrome now allows persisting the folder permissions – let's explore that:

https://developer.chrome.com/blog/persistent-permissions-for-the-file-system-access-api

But even if you have granted write permission to the folder before, you now need to grant access again. This gets tiring really quickly.

[bgrgicak]

I'm adding this to the Web app redesign project because it will significantly improve the user experience of the site manager.