Add share / save / mark-read toolbar buttons to detail and reader views

Both StoryDetailView and ArticleReaderView now show three icon buttons in
the navigation bar trailing area:
- Share (square.and.arrow.up) — story headline+summary+URL / article
  headline+sourceUrl, passed to UIActivityViewController via ShareSheet.
- Save (bookmark / bookmark.fill, orange when active) — toggles SavedStory
  in SwiftData; StoryDetailView also ensures a CachedStory exists so the
  Saved tab can display it offline.
- Mark read/unread (checkmark.circle / checkmark.circle.fill, orange when
  read) — toggle mirroring the swipe action already present in the feed.

The read state in StoryDetailView is still auto-marked on open (.task
→ markRead()); the toolbar button lets users undo that without going back
to the feed. ArticleReaderView targets the parent story (route.storyId).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Jarvis/Views/Reader/ArticleReaderView.swift

@@ -72,9 +72,14 @@ struct ArticleReaderView: View {
     @Environment(\.modelContext) private var modelContext
     @StateObject private var vm = ArticleReaderViewModel()
     @Query private var cachedArticles: [CachedArticle]
+    @Query private var readStories:  [ReadStory]
+    @Query private var savedStories: [SavedStory]
+    @State private var showShare = false
 
     private var article: Article? { vm.article }
     private var isCached: Bool { cachedArticles.contains { $0.id == route.articleId } }
+    private var isRead:  Bool { readStories.contains  { $0.id == route.storyId } }
+    private var isSaved: Bool { savedStories.contains { $0.id == route.storyId } }
 
     private var backTitle: String {
         let h = route.parentHeadline
@@ -100,13 +105,64 @@ struct ArticleReaderView: View {
         .navigationBarBackButtonHidden(true)
         .toolbar {
             ToolbarItem(placement: .topBarLeading) { backButton }
+            ToolbarItemGroup(placement: .topBarTrailing) {
+                Button { showShare = true } label: {
+                    Image(systemName: "square.and.arrow.up")
+                        .font(.system(size: 16, weight: .semibold))
+                        .foregroundStyle(Color(hex: "888888"))
+                }
+                Button { toggleSave() } label: {
+                    Image(systemName: isSaved ? "bookmark.fill" : "bookmark")
+                        .font(.system(size: 16, weight: .semibold))
+                        .foregroundStyle(isSaved ? Palette.orange : Color(hex: "888888"))
+                }
+                Button { toggleRead() } label: {
+                    Image(systemName: isRead ? "checkmark.circle.fill" : "checkmark.circle")
+                        .font(.system(size: 17, weight: .semibold))
+                        .foregroundStyle(isRead ? Palette.orange : Color(hex: "888888"))
+                }
+            }
         }
         .toolbarBackground(Color.black, for: .navigationBar)
         .toolbarBackground(.visible, for: .navigationBar)
         .preferredColorScheme(.dark)
+        .sheet(isPresented: $showShare) { ShareSheet(items: shareContent) }
         .task { await vm.load(route: route, context: modelContext) }
     }
 
+    // MARK: - Actions
+
+    private func toggleRead() {
+        let id = route.storyId
+        if let row = (try? modelContext.fetch(
+                FetchDescriptor<ReadStory>(predicate: #Predicate { $0.id == id })))?.first {
+            modelContext.delete(row)
+        } else {
+            modelContext.insert(ReadStory(id: id))
+        }
+        try? modelContext.save()
+    }
+
+    private func toggleSave() {
+        let id = route.storyId
+        if let row = (try? modelContext.fetch(
+                FetchDescriptor<SavedStory>(predicate: #Predicate { $0.id == id })))?.first {
+            modelContext.delete(row)
+        } else {
+            modelContext.insert(SavedStory(id: id))
+        }
+        try? modelContext.save()
+    }
+
+    private var shareContent: [Any] {
+        guard let art = vm.article else { return [] }
+        var items: [Any] = ["\(art.headline)\n\nvia Jarvis"]
+        if !art.sourceUrl.isEmpty, let url = URL(string: art.sourceUrl) {
+            items.append(url)
+        }
+        return items
+    }
+
     private var backButton: some View {
         Button { dismiss() } label: {
             HStack(spacing: 4) {