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cdricms
c670dda0a9
Tapping an approval notification while the app was backgrounded crashed on iOS
with "Call must be made on main thread". The UNUserNotificationCenterDelegate
methods are `async` and nonisolated, so their continuation resumes off the main
thread at the return point — where UIKit synchronously runs state-restoration /
snapshot work, tripping the main-thread assertion. (The empty iOS `didReceive`
body didn't matter; even an empty async method returns off-main.)
Isolate NotificationPresenter to `@MainActor` so the delegate returns on the main
thread. `@preconcurrency` on the UNUserNotificationCenterDelegate conformance is
required because those requirements are nonisolated with non-Sendable UN*
parameters, which strict concurrency won't otherwise let a main-actor type
witness. The macOS branch's now-redundant `await MainActor.run { … }` is dropped.