Build Home Screen, Lock Screen, StandBy, and Control Center widgets for iOS with WidgetKit — Widget/WidgetBundle @main, TimelineProvider vs AppIntentTimelineProvider, TimelineEntry + TimelineReloadPolicy, StaticConfiguration vs AppIntentConfiguration (WidgetConfigurationIntent), WidgetFamily layouts, containerBackground, interactive Button/Toggle backed by AppIntent/SetValueIntent (iOS 17+), ControlWidget / ControlWidgetButton / ControlWidgetToggle for Control Center (iOS 18), widgetURL deep links, Smart Stack relevance (TimelineEntryRelevance + App Intents RelevantContext), App Groups data sharing, WidgetCenter.reloadTimelines, WidgetKit push reloads, and the refresh bud…
