Added basic notification trigger support

[fhasse95]

This PR enhances the local push notification capabilities by introducing scheduled delivery via UNTimeIntervalNotificationTrigger and UNCalendarNotificationTrigger. It focuses on single-event scheduling by evaluating the nextTriggerDate of the specific trigger, providing a solid foundation for timed push notifications while keeping the initial implementation simple by omitting recurring intervals.

To try it out, you can check out the NotificationPlayground in either Skip Showcase or Skip Showcase Fuse.

Related PRs:

• Added support for nextDate and enumerateDates to Calendar skip-foundation#93
• Added basic notification trigger support skip-fuse-ui#88
• Added local notification playground skipapp-showcase#64
• Added local notification playground skipapp-showcase-fuse#45

---

Thank you for contributing to the Skip project! Please review the contribution guide at https://skip.dev/docs/contributing/ for advice and guidance on making high-quality PRs.

Use this space to describe your change and add any labels (bug, enhancement, documentation, etc.) to help categorize your contribution.

Skip Pull Request Checklist:

• REQUIRED: I have signed the Contributor Agreement
• REQUIRED: I have tested my change locally with swift test
• OPTIONAL: I have tested my change on an iOS simulator or device
• OPTIONAL: I have tested my change on an Android emulator or device
• REQUIRED: I have checked whether this change requires a corresponding update in the Skip Fuse UI repository (link related PR if applicable)
• OPTIONAL: I have added an example of any UI changes in the Showcase sample app

---

• AI was used to generate or assist with generating this PR. Please specify below how you used AI to help you, and what steps you have taken to manually verify the changes.

---

[fhasse95]

Hi @marcprux,
I’m not sure if it crossed your radar, but this PR and the related ones mentioned above are all ready for review.
Looking forward to your feedback whenever you have a moment! 😊

[marcprux]

Apologies for the lengthy review time; I needed to be sure I understood what was happening here, which I think I do now. I assume you've tested it out locally a fair amount? Any screenshots you could post would be handy…

I do think this is a valuable feature. In hindsight, I wish we had kept notifications out of skip-ui altogether and externalized it somewhere like skip-notify, where I'd be more comfortable making experimental changes; but we can't break compatibility at this point.

My other reservation is adding the new androidx-work dependency, but it doesn't seem to be too large a dependency, and it is stable.

All that is to say, I think we're good with merging this once you make the one minor change (changing the "notifications" key).