Add notifications: morning/evening briefings + breaking alerts

- Settings hub (gear → SettingsView) hosting Notifications and Connectivity
  (Connectivity previously had no entry point).
- NotificationsView: permission flow, breaking/new-story alerts with a
  min-signal threshold, morning & evening briefings with time pickers, and a
  weather toggle + location, plus a "send test briefing" action.
- NotificationManager: schedules daily briefings, builds "Jarvis" content
  (weather + top signal stories), fires breaking alerts off WebSocket
  story.created events, and refreshes via a BGAppRefresh task.
- WeatherService: Open-Meteo geocoding + daily forecast (no API key/entitlement).
- AppDelegate registers the background-refresh handler at launch; Info.plist
  gains UIBackgroundModes + BGTaskSchedulerPermittedIdentifiers.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Jarvis/JarvisApp.swift

@@ -2,14 +2,33 @@
 
 import SwiftUI
 import SwiftData
+import UIKit
+import BackgroundTasks
+
+final class AppDelegate: NSObject, UIApplicationDelegate {
+    func application(_ application: UIApplication,
+                     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
+        // Register the briefing background-refresh handler before launch completes.
+        BGTaskScheduler.shared.register(forTaskWithIdentifier: jarvisBriefingRefreshID, using: nil) { task in
+            Task { @MainActor in
+                await NotificationManager.shared.applySettings()
+                NotificationManager.shared.scheduleBackgroundRefresh()
+                task.setTaskCompleted(success: true)
+            }
+        }
+        return true
+    }
+}
 
 @main
 struct JarvisApp: App {
+    @UIApplicationDelegateAdaptor(AppDelegate.self) private var appDelegate
     @StateObject private var settings = ServerSettings.shared
     @StateObject private var store = StoryStore.shared
     @StateObject private var ws = WebSocketManager.shared
     @StateObject private var connectivity = ConnectivitySettings.shared
     @StateObject private var connManager = ConnectivityManager.shared
+    @StateObject private var notifications = NotificationManager.shared
 
     var body: some Scene {
         WindowGroup {
@@ -25,9 +44,11 @@ struct JarvisApp: App {
             .environmentObject(ws)
             .environmentObject(connectivity)
             .environmentObject(connManager)
+            .environmentObject(notifications)
             .task {
                 connManager.start()
                 await connManager.resolveAndActivate()
+                await notifications.bootstrap()
             }
         }
         .modelContainer(for: [CachedStory.self, CachedArticle.self])