fix: resync schedules on app return

[Microck]

What

• resyncs scheduled sessions when the app becomes active again
• refreshes upcoming schedule notifications after load and persist
• keeps notification side effects disabled under automated tests

Validation

• docker run --rm -v \"$PWD/ios:/workspace\" -w /workspace swift:5.10-jammy swift test
• GitHub Actions IPA build 23950270224
• BrowserStack click-through on the signed follow-up IPA, including schedule create/save, background return, and release