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/Views/Home/SignalFeedView.swift

@@ -23,6 +23,7 @@ struct SignalFeedView: View {
     @Query private var cachedStories: [CachedStory]
     @Query private var cachedArticles: [CachedArticle]
     @State private var showFeeds = false
+    @State private var showSettings = false
 
     /// Stories that have full article content cached → eligible for the green dot.
     private var cachedStoryIds: Set<String> { Set(cachedArticles.map(\.storyId)) }
@@ -64,6 +65,9 @@ struct SignalFeedView: View {
             .sheet(isPresented: $showFeeds) {
                 FeedManagerView()
             }
+            .sheet(isPresented: $showSettings) {
+                SettingsView()
+            }
         }
         .preferredColorScheme(.dark)
         .onChange(of: store.stories) { _, newValue in
@@ -86,6 +90,14 @@ struct SignalFeedView: View {
                     .foregroundStyle(Color(hex: "888888"))
                     .frame(width: 44, height: 44)
             }
+            Button {
+                showSettings = true
+            } label: {
+                Image(systemName: "gearshape")
+                    .font(.system(size: 17, weight: .semibold))
+                    .foregroundStyle(Color(hex: "888888"))
+                    .frame(width: 44, height: 44)
+            }
         }
         .padding(.horizontal, 16)
         .padding(.top, 8)