fix: pick server scene leaking issue

Mastodon/Diffiable/Section/CategoryPickerSection.swift

@@ -16,7 +16,8 @@ extension CategoryPickerSection {
         for collectionView: UICollectionView,
         dependency: NeedsDependency
     ) -> UICollectionViewDiffableDataSource<CategoryPickerSection, CategoryPickerItem> {
-        UICollectionViewDiffableDataSource(collectionView: collectionView) { collectionView, indexPath, item -> UICollectionViewCell? in
+        UICollectionViewDiffableDataSource(collectionView: collectionView) { [weak dependency] collectionView, indexPath, item -> UICollectionViewCell? in
+            guard let _ = dependency else { return nil }
             let cell = collectionView.dequeueReusableCell(withReuseIdentifier: String(describing: PickServerCategoryCollectionViewCell.self), for: indexPath) as! PickServerCategoryCollectionViewCell
             switch item {
             case .all:

Mastodon/Diffiable/Section/CustomEmojiPickerSection.swift

@@ -17,7 +17,8 @@ extension CustomEmojiPickerSection {
         for collectionView: UICollectionView,
         dependency: NeedsDependency
     ) -> UICollectionViewDiffableDataSource<CustomEmojiPickerSection, CustomEmojiPickerItem> {
-        let dataSource = UICollectionViewDiffableDataSource<CustomEmojiPickerSection, CustomEmojiPickerItem>(collectionView: collectionView) { collectionView, indexPath, item -> UICollectionViewCell? in
+        let dataSource = UICollectionViewDiffableDataSource<CustomEmojiPickerSection, CustomEmojiPickerItem>(collectionView: collectionView) { [weak dependency] collectionView, indexPath, item -> UICollectionViewCell? in
+            guard let _ = dependency else { return nil }
             switch item {
             case .emoji(let attribute):
                 let cell = collectionView.dequeueReusableCell(withReuseIdentifier: String(describing: CustomEmojiPickerItemCollectionViewCell.self), for: indexPath) as! CustomEmojiPickerItemCollectionViewCell

Mastodon/Diffiable/Section/PickServerSection.swift

@@ -25,7 +25,13 @@ extension PickServerSection {
         pickServerSearchCellDelegate: PickServerSearchCellDelegate,
         pickServerCellDelegate: PickServerCellDelegate
     ) -> UITableViewDiffableDataSource<PickServerSection, PickServerItem> {
-        UITableViewDiffableDataSource(tableView: tableView) { [weak pickServerCategoriesCellDelegate, weak pickServerSearchCellDelegate, weak pickServerCellDelegate] tableView, indexPath, item -> UITableViewCell? in
+        UITableViewDiffableDataSource(tableView: tableView) { [
+            weak dependency,
+            weak pickServerCategoriesCellDelegate,
+            weak pickServerSearchCellDelegate,
+            weak pickServerCellDelegate
+        ] tableView, indexPath, item -> UITableViewCell? in
+            guard let dependency = dependency else { return nil }
             switch item {
             case .header:
                 let cell = tableView.dequeueReusableCell(withIdentifier: String(describing: PickServerTitleCell.self), for: indexPath) as! PickServerTitleCell

Mastodon/Scene/HomeTimeline/HomeTimelineViewController+DebugAction.swift

@@ -21,6 +21,10 @@ extension HomeTimelineViewController {
             children: [
                 moveMenu,
                 dropMenu,
+                UIAction(title: "Show Welcome", image: UIImage(systemName: "figure.walk"), attributes: []) { [weak self] action in
+                    guard let self = self else { return }
+                    self.showWelcomeAction(action)
+                },
                 UIAction(title: "Show Public Timeline", image: UIImage(systemName: "list.dash"), attributes: []) { [weak self] action in
                     guard let self = self else { return }
                     self.showPublicTimelineAction(action)
@@ -277,6 +281,10 @@ extension HomeTimelineViewController {
         .store(in: &disposeBag)
     }
     
+    @objc private func showWelcomeAction(_ sender: UIAction) {
+        coordinator.present(scene: .welcome, from: self, transition: .modal(animated: true, completion: nil))
+    }
+    
     @objc private func showPublicTimelineAction(_ sender: UIAction) {
         coordinator.present(scene: .publicTimeline, from: self, transition: .show)
     }

Mastodon/Scene/Onboarding/PickServer/MastodonPickServerViewController.swift

@@ -67,6 +67,17 @@ extension MastodonPickServerViewController {
         setupOnboardingAppearance()
         defer { setupNavigationBarBackgroundView() }
 
+        #if DEBUG
+        navigationItem.rightBarButtonItem = UIBarButtonItem(image: UIImage(systemName: "ellipsis.circle"), style: .plain, target: nil, action: nil)
+        let children: [UIMenuElement] = [
+            UIAction(title: "Dismiss", image: nil, identifier: nil, discoverabilityTitle: nil, attributes: [], state: .off, handler: { [weak self] _ in
+                guard let self = self else { return }
+                self.dismiss(animated: true, completion: nil)
+            })
+        ]
+        navigationItem.rightBarButtonItem?.menu = UIMenu(title: "Debug Tool", image: nil, identifier: nil, options: [], children: children)
+        #endif
+        
         view.addSubview(nextStepButton)
         NSLayoutConstraint.activate([
             nextStepButton.leadingAnchor.constraint(equalTo: view.readableContentGuide.leadingAnchor, constant: MastodonPickServerViewController.actionButtonMargin),

Mastodon/Scene/Onboarding/PickServer/MastodonPickServerViewModel.swift

@@ -75,6 +75,14 @@ class MastodonPickServerViewModel: NSObject {
         configure()
     }
     
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
+    }
+    
+}
+
+extension MastodonPickServerViewModel {
+    
     private func configure() {
         Publishers.CombineLatest(
             filteredIndexedServers.eraseToAnyPublisher(),