fix: remove mark-as-read on scroll — was marking everything read on load

.onAppear fires for all visible rows when the list renders, marking
everything as read immediately. Removed — entries only mark as read
when you tap into the article (handled in ArticleView).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ios/Platform/Platform/Features/Reader/Views/EntryListView.swift

@@ -42,12 +42,6 @@ struct EntryListView: View {
                 }
                 .buttonStyle(.plain)
                 .contentShape(Rectangle())
-                .onAppear {
-                    // Mark as read when scrolled into view (card mode)
-                    if !entry.isRead {
-                        Task { await vm.markAsRead(entry) }
-                    }
-                }
                 .contextMenu {
                     entryContextMenu(entry: entry, vm: vm)
                 }