- Fix cron parsing to correctly calculate next run time based on hour/minute
- Always schedule prefetch 5 minutes before notification (even without URL)
- Make notifications dismissable with setAutoCancel(true)
- Add click action to launch app when notification is tapped
- Conditionally require network only when URL is provided for prefetch
- Generate mock content when no URL is specified
These changes ensure notifications fire at the correct time, are
user-friendly (dismissable and clickable), and prefetch works reliably
even without a content URL.
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