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/Views/PodcastPlayerView.swift

@@ -59,7 +59,7 @@ final class PodcastPlayerViewModel {
     private var interruptionObserver: Any?
     private var currentPodcastTitle: String = "Marks Podcast"
 
-    func start(articleUrl: String, articleTitle: String = "", claude: ClaudeService) {
+    func start(articleUrl: String, articleTitle: String = "", claude: ClaudeService, parentBookmarkUrl: String? = nil) {
         // Idempotent — don't restart if already generating or playing this article
         if currentArticleUrl == articleUrl && (player != nil || pollingTask != nil) { return }
 
@@ -90,7 +90,7 @@ final class PodcastPlayerViewModel {
                     )
                     if job.isDone {
                         phase = .downloading
-                        let audioUrl = try await claude.downloadPodcastAudio(jobId: jobId, articleUrl: articleUrl, title: job.title)
+                        let audioUrl = try await claude.downloadPodcastAudio(jobId: jobId, articleUrl: articleUrl, title: job.title, parentBookmarkUrl: parentBookmarkUrl)
                         setupPlayer(url: audioUrl, title: job.title ?? "Podcast")
                         return
                     }
@@ -674,3 +674,72 @@ struct PodcastLibraryView: View {
         if vm.currentArticleUrl == entry.articleUrl { vm.stop() }
     }
 }
+
+// MARK: - Episode picker (multiple episodes per bookmark)
+
+struct EpisodePickerView: View {
+    let bookmark: Bookmark
+    let vm: PodcastPlayerViewModel
+    let claude: ClaudeService
+
+    @State private var entries: [PodcastEntry] = []
+    @Environment(\.dismiss) private var dismiss
+
+    var body: some View {
+        NavigationStack {
+            List {
+                ForEach(entries) { entry in
+                    HStack(spacing: 12) {
+                        VStack(alignment: .leading, spacing: 4) {
+                            Text(entry.title ?? entry.articleUrl)
+                                .font(.system(size: 15, weight: .medium))
+                                .lineLimit(2)
+                            if entry.articleUrl != bookmark.url {
+                                Text(entry.articleUrl)
+                                    .font(.system(size: 11))
+                                    .foregroundStyle(.tertiary)
+                                    .lineLimit(1)
+                            }
+                            Text(entry.createdAt.formatted(date: .abbreviated, time: .omitted))
+                                .font(.system(size: 12))
+                                .foregroundStyle(.secondary)
+                        }
+                        Spacer()
+                        Button {
+                            vm.start(articleUrl: entry.articleUrl,
+                                     articleTitle: entry.title ?? bookmark.displayTitle,
+                                     claude: claude)
+                            dismiss()
+                        } label: {
+                            Image(systemName: "play.circle.fill")
+                                .font(.system(size: 36))
+                                .foregroundStyle(.blue)
+                        }
+                        .buttonStyle(.plain)
+                    }
+                    .padding(.vertical, 6)
+                    .swipeActions(edge: .trailing, allowsFullSwipe: true) {
+                        Button(role: .destructive) { deleteEntry(entry) } label: {
+                            Label("Delete", systemImage: "trash")
+                        }
+                    }
+                }
+            }
+            .listStyle(.plain)
+            .navigationTitle("Episodes")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .topBarTrailing) {
+                    Button("Done") { dismiss() }
+                }
+            }
+        }
+        .onAppear { entries = PodcastIndex.find(for: bookmark.url) }
+    }
+
+    private func deleteEntry(_ entry: PodcastEntry) {
+        PodcastIndex.remove(articleUrl: entry.articleUrl)
+        entries.removeAll { $0.articleUrl == entry.articleUrl }
+        if vm.currentArticleUrl == entry.articleUrl { vm.stop() }
+    }
+}