debug: round 3 — log which guard fails when entry near top

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

@@ -99,6 +99,20 @@ struct EntryListView: View {
                             }
 
                             // --- Mark-as-read ---
+                            if vm.entries.prefix(3).contains(where: { $0.id == entryId }) && frame.maxY < 50 {
+                                var fails: [String] = []
+                                if !trackingActive { fails.append("inactive(\(Int(cumulativeDown))/\(Int(activationThreshold)))") }
+                                if !isScrollingDown { fails.append("notDown") }
+                                if entry.isRead { fails.append("alreadyRead") }
+                                if markedByScroll.contains(entryId) { fails.append("alreadyMarked") }
+                                if !wasVisible.contains(entryId) { fails.append("notVisible") }
+                                if frame.maxY >= 0 { fails.append("aboveVP(\(Int(frame.maxY)))") }
+                                if fails.isEmpty {
+                                    print("[SCROLL] ✅ WILL MARK id=\(entryId)")
+                                } else {
+                                    print("[SCROLL] ❌ id=\(entryId) maxY=\(Int(frame.maxY)) fails=\(fails.joined(separator: ","))")
+                                }
+                            }
                             guard trackingActive,
                                   isScrollingDown,
                                   !entry.isRead,