Podcast UX baseline: mini player during generation, end-of-track reset, library view

- Mini player shows as soon as generation starts (not just when audio ready)
- Idempotency: tapping headphones again during generation is a no-op
- Playback resets to position 0 on completion (standard player behavior)
- Stop button in full player visible during generation
- PodcastLibraryView lists all generated podcasts
- Sparkles menu gains Podcasts entry
- Fix AnalyticsService Sendable error (serialize before Task.detached boundary)

Marks/Views/BookmarksView.swift

@@ -11,6 +11,7 @@ struct BookmarksView: View {
     @State private var editingBookmark: Bookmark?
     @State private var browsingBookmark: Bookmark?
     @State private var showFullPlayer = false
+    @State private var showPodcastLibrary = false
     @State private var readingProgress: [String: Double] = ReadingProgress.all()
 
     var body: some View {
@@ -118,6 +119,11 @@ struct BookmarksView: View {
                         } label: {
                             Label("Enrich All with AI", systemImage: "wand.and.stars")
                         }
+                        Button {
+                            showPodcastLibrary = true
+                        } label: {
+                            Label("Podcasts", systemImage: "headphones")
+                        }
                     } label: {
                         Image(systemName: "sparkles")
                     }
@@ -150,7 +156,7 @@ struct BookmarksView: View {
             }
             .overlay(alignment: .bottom) {
                 VStack(spacing: 8) {
-                    if viewModel.podcastPlayer.player != nil {
+                    if !viewModel.podcastPlayer.currentArticleUrl.isEmpty {
                         MiniPlayerView(vm: viewModel.podcastPlayer) {
                             showFullPlayer = true
                         }
@@ -160,7 +166,7 @@ struct BookmarksView: View {
                         enrichmentBanner
                     }
                 }
-                .animation(.spring(duration: 0.3), value: viewModel.podcastPlayer.player != nil)
+                .animation(.spring(duration: 0.3), value: !viewModel.podcastPlayer.currentArticleUrl.isEmpty)
                 .padding(.bottom, 8)
             }
         }
@@ -193,6 +199,9 @@ struct BookmarksView: View {
                 stopOnDismiss: false
             )
         }
+        .sheet(isPresented: $showPodcastLibrary) {
+            PodcastLibraryView(vm: viewModel.podcastPlayer, claude: viewModel.claude)
+        }
         .refreshable {
             await viewModel.load()
         }