Rerequest push notifications

[mpivchev]

NCKit: nextcloud/NextcloudKit#231
Fixes #4145

Rerequest each notification from server so it's up to date. This resolves issue where a notification would show the wrong content.

• Tested with multiple accounts, 2 accounts from same instance and 1 from a different instance. Notifications behave as usual, but have updated content if needed.
• Tested NCKit timeout + serviceExtensionTimeWillExpire timeout

[Copilot]

Pull request overview

This PR updates the Notification Service Extension to re-request the full notification payload from the Nextcloud server (using the notification ID from the push payload) so the displayed content is reconstructed for the logged-in user, matching Android/Desktop behavior and addressing issue #4145.

Changes:

• Decrypt push payload to identify the matching account and extract nid, then fetch the up-to-date notification from the server.
• Update the delivered notification title/body based on the server response when available.
• Add a single-delivery guard (OSAllocatedUnfairLock + deliver()) to avoid double-calling the content handler (normal completion vs. time-expiry).

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 4 comments.