Add comprehensive logging to trace rollover notification handling
from AppDelegate delivery through to next notification scheduling.
This enables diagnosis of why rollover notifications fail to
schedule the next 24-hour notification.
Changes:
- Log observer registration on plugin load
- Log handler entry and data extraction in handleNotificationDelivery
- Log processing steps in processRollover including:
* Missing scheduler/storage detection
* Content lookup failures with available IDs
* ScheduleNextNotification success/failure
These logs will help identify whether the issue is:
- Observer not receiving notifications
- Content missing from storage
- Scheduling logic failing silently
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