[bug] Disabling already-disabled global notification does not update organization-level settings

[pandafy]

Describe the bug
Disabling the already disabled global notification setting does not disable Organization-level notification settings. This results in an inconsistent state where the UI reflects all notifications are disabled, but organization-level notifications are still enabled.

Steps To Reproduce
Steps to reproduce the behavior:

1. Create a superuser and navigate to http://127.0.0.1:8000/notifications/preferences/
2. Ensure all notifications for the user are enabled.
3. Disable the global email settings.
4. Step 3 will disable email notifications for all notification types and organizations.
5. Enable the email notifications for the default organization.
6. At this point, you will have global email notification disabled, but the email notifications for the default organization should be enabled.
7. Try to disable the global email notifications again:
   1. Click on the global email notification setting dropdown
   2. Select "Don't notify by email"
   3. Click on "Confirm" on the popup
8. UI will update reflecting that emails for all organizations are disabled
9. Refresh the page

Expected behavior
All email notifications are disabled

Actual result
Global email notifications are disabled as expected.
Organization email notifications are still enabled.

openwisp-notifications-2025-11-27_18.15.05.mp4

Proposed solutions

1. Change the view such that disabling the global notification setting forces disabling all notifications.
2. Do not allow clicking on the selected global notification setting.
   In order to disable all notifications, the user will first have to enable the global notification and then disable it again. This solution has poor UX.

[AditiSah05]

Hello Mentors,
I have initiated work on this task to ensure timely progress. At your convenience, please assign it to me officially so I can continue working on it.
Regards,
Aditi Sah

[pandafy]

Hey @AditiSah05, you can go ahead and work on this. If you need any clarifications, let us know.

[kirmada1509]

I would like to implement a fix for this, please assign this issue to me.