Improve bookmark selection logic for iPad and add missing sheet for shared bookmarks

- On iPad, allow re-selecting the same bookmark by deselecting and reselecting it, ensuring detail view updates.
- Add missing .sheet for showing AddBookmarkView when adding from share extension.
- Refactor .task to .onAppear for loading bookmarks on view appearance.
- Minor cleanup in SettingsViewModel (remove outdated comment).

readeck/UI/Bookmarks/BookmarksView.swift

@@ -29,8 +29,16 @@ struct BookmarksView: View {
                                 if UIDevice.isPhone {
                                     selectedBookmarkId = bookmark.id
                                 } else {
+                                    if selectedBookmark?.id == bookmark.id {
+                                        // Optional: Deselect, um erneutes Auswählen zu ermöglichen
+                                        selectedBookmark = nil
+                                        DispatchQueue.main.async {
                                             selectedBookmark = bookmark
                                         }
+                                    } else {
+                                        selectedBookmark = bookmark
+                                    }
+                                }
                             }) {
                                 BookmarkCardView(
                                     bookmark: bookmark,
@@ -116,6 +124,9 @@ struct BookmarksView: View {
             .sheet(isPresented: $showingAddBookmark) {
                 AddBookmarkView(prefilledURL: shareURL, prefilledTitle: shareTitle)
             }
+            .sheet(isPresented: $viewModel.showingAddBookmarkFromShare, content: {
+                AddBookmarkView(prefilledURL: shareURL, prefilledTitle: shareTitle)
+            })
             /*.alert("Fehler", isPresented: .constant(viewModel.errorMessage != nil)) {
                 Button("OK", role: .cancel) {
                     viewModel.errorMessage = nil
@@ -123,9 +134,11 @@ struct BookmarksView: View {
             } message: {
                 Text(viewModel.errorMessage ?? "")
             }*/
-            .task {
+            .onAppear {
+                Task {
                     await viewModel.loadBookmarks(state: state)
                 }
+            }
             .onChange(of: showingAddBookmark) { oldValue, newValue in
                 // Refresh bookmarks when sheet is dismissed
                 if oldValue && !newValue {

readeck/UI/Settings/SettingsViewModel.swift

@@ -59,7 +59,7 @@ class SettingsViewModel {
                 endpoint = settings.endpoint ?? ""
                 username = settings.username ?? ""
                 password = settings.password ?? ""
-                isLoggedIn = settings.isLoggedIn // Verwendet die neue Hilfsmethode
+                isLoggedIn = settings.isLoggedIn
             }
         } catch {
             errorMessage = "Fehler beim Laden der Einstellungen"