Use when touching widgets, animations, networking configuration, or background/observer cleanup — battery and performance patterns for WidgetKit timelines, SwiftUI animations, Low Power Mode handling, URLSession config, and NotificationCenter/Task cleanup under `@Observable`.
Use when touching widgets, animations, networking configuration, or background/observer cleanup — battery and performance patterns for WidgetKit timelines, SwiftUI animations, Low Power Mode handling, URLSession config, and NotificationCenter/Task cleanup under `@Observable`.