Notification summary - different timers for different apps

The notification summary is my favourite Niagara feature. It’s helped me stop checking my phone all the time.

The only thing that still breaks the flow is WhatsApp - I still get notified the moment a message arrives, which pulls me straight back in. Two small changes would fix this:

1. Let users choose the summary interval instead of keeping it fixed at 6 hours.

2. Allow different intervals per app, e.g. 3 hours for most apps, but 30 minutes for WhatsApp. That way, messages don’t arrive half a day late, but you’re also not reacting to every single ping.