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/Info.plist

@@ -2,6 +2,10 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>BGTaskSchedulerPermittedIdentifiers</key>
+	<array>
+		<string>com.kisani.jarvis.briefing.refresh</string>
+	</array>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 	<key>CFBundleDisplayName</key>
@@ -35,6 +39,11 @@
 	</dict>
 	<key>NSLocalNetworkUsageDescription</key>
 	<string>Jarvis connects to your self-hosted news platform on the local network.</string>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>fetch</string>
+		<string>processing</string>
+	</array>
 	<key>UILaunchScreen</key>
 	<dict>
 		<key>UIColorName</key>