Add [intert] attr to #root when in modal

[maxpatiiuk]

New HTML attribute has been added for modal dialogs:

https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/inert

It should be added to the #root element when in modal dialog.

Besides the improvements for screen readers, it would also reduce the need for focus management and (in some browsers), make Cmd+F ignore the content behind the dialog

[specifysoftware]

This issue has been mentioned on Specify Community Forum. There might be relevant details there:

https://discourse.specifysoftware.org/t/specify-7-8-12-release-announcement/1202/1