Fix ShareExtension "Open Marks first" + add widget + BookmarkListRow polish

- Save serverConfig to App Group on every app launch so ShareExtension
  can always find credentials without requiring a disconnect/reconnect flow
- Add MarksWidget target with RandomBookmarkWidget (random saved bookmark,
  reloads hourly) using file-based App Group storage to avoid CFPreferences issues
- Extract BookmarkListRow as shared component with editorial typography tweaks
  (17pt semibold title, 13pt domain, relative date, 32×32 favicon, italic AI summary,
  20pt podcast icon, 16pt horizontal insets)
- Add MarksWidget and ShareExtension Xcode schemes for direct run/debug

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

Marks/MarksApp.swift

@@ -18,16 +18,24 @@ struct MarksApp: App {
                 defaultConfig.save()
                 serverConfig = defaultConfig
             }
+            .task { serverConfig.save() }
         }
     }
 }
 
+private struct IdentifiableURL: Identifiable {
+    let id = UUID()
+    let url: URL
+}
+
 // Holds the API + ViewModel so they survive re-renders
 struct MainContainer: View {
     let config: ServerConfig
     let onDisconnect: () -> Void
 
     @State private var viewModel: BookmarksViewModel
+    @State private var deepLinkBrowser: IdentifiableURL?
+    @State private var showDeepLinkPlayer = false
 
     init(config: ServerConfig, onDisconnect: @escaping () -> Void) {
         self.config = config
@@ -48,5 +56,45 @@ struct MainContainer: View {
                 SearchView(viewModel: viewModel)
             }
         }
+        .onOpenURL { url in
+            handleDeepLink(url)
+        }
+        .sheet(item: $deepLinkBrowser) { item in
+            BrowserView(url: item.url, title: item.url.host ?? "", claude: viewModel.claude, podcastPlayer: viewModel.podcastPlayer)
+        }
+        .sheet(isPresented: $showDeepLinkPlayer) {
+            PodcastPlayerView(
+                vm: viewModel.podcastPlayer,
+                articleUrl: viewModel.podcastPlayer.currentArticleUrl,
+                articleTitle: viewModel.podcastPlayer.currentArticleTitle,
+                claude: viewModel.claude,
+                stopOnDismiss: false
+            )
+        }
+    }
+
+    private func handleDeepLink(_ url: URL) {
+        guard url.scheme == "marks",
+              let comps = URLComponents(url: url, resolvingAgainstBaseURL: false),
+              let articleUrl = comps.queryItems?.first(where: { $0.name == "url" })?.value
+        else { return }
+
+        switch url.host {
+        case "bookmark":
+            if let browserURL = URL(string: articleUrl) {
+                deepLinkBrowser = IdentifiableURL(url: browserURL)
+            }
+        case "podcast":
+            let podcasts = WidgetDataStore.loadPodcasts()
+            let found = podcasts.first { $0.articleUrl == articleUrl }
+            viewModel.podcastPlayer.start(
+                articleUrl: articleUrl,
+                articleTitle: found?.title ?? "",
+                claude: viewModel.claude
+            )
+            showDeepLinkPlayer = true
+        default:
+            break
+        }
     }
 }