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/Services/ClaudeService.swift

@@ -67,13 +67,13 @@ struct ClaudeService: Sendable {
         return try JSONDecoder().decode(PodcastStatus.self, from: data)
     }
 
-    func downloadPodcastAudio(jobId: String, articleUrl: String, title: String? = nil) async throws -> URL {
+    func downloadPodcastAudio(jobId: String, articleUrl: String, title: String? = nil, parentBookmarkUrl: String? = nil) async throws -> URL {
         let dest = ClaudeService.cachedPodcastURL(for: articleUrl)
         try FileManager.default.createDirectory(at: dest.deletingLastPathComponent(),
                                                 withIntermediateDirectories: true)
         let data = try await get("/v1/podcast/audio/\(jobId)")
         try data.write(to: dest, options: .atomic)
-        PodcastIndex.upsert(articleUrl: articleUrl, filename: dest.lastPathComponent, title: title)
+        PodcastIndex.upsert(articleUrl: articleUrl, filename: dest.lastPathComponent, title: title, parentBookmarkUrl: parentBookmarkUrl)
         return dest
     }