debug: Reader comprehensive logging — jitter, markRead, loadMore

ios/Platform/Platform/Features/Reader/ViewModels/ReaderViewModel.swift

@@ -94,15 +94,19 @@ final class ReaderViewModel {
     func loadMore() async {
         guard !isLoadingMore, hasMore else { return }
         isLoadingMore = true
+        print("[READER-DBG] 📥 loadMore START offset=\(offset)")
 
         do {
             let list = try await fetchEntries(offset: offset)
+            let count = list.entries.count
             entries.append(contentsOf: list.entries)
             total = list.total
-            offset += list.entries.count
+            offset += count
             hasMore = offset < list.total
+            print("[READER-DBG] 📥 loadMore END +\(count) total=\(entries.count) hasMore=\(hasMore)")
         } catch {
             self.error = error.localizedDescription
+            print("[READER-DBG] 📥 loadMore ERROR: \(error)")
         }
         isLoadingMore = false
     }

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

@@ -123,6 +123,7 @@ struct EntryListView: View {
                                   frame.maxY < 30 else { return }
 
                             markedByScroll.insert(entryId)
+                            print("[READER-DBG] 📖 markRead id=\(entryId) autoScroll=\(isAutoScrolling) maxY=\(Int(frame.maxY))")
 
                             if isAutoScrolling {
                                 // Defer visual update — contentSize changes cause jitter

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

@@ -98,20 +98,36 @@ struct ScrollViewDriver: UIViewRepresentable {
             displayLink = nil
         }
 
+        private var lastTickTime: CFAbsoluteTime = 0
+        private var lastContentSize: CGFloat = 0
+        private var tickCount = 0
+
         @objc private func tick(_ link: CADisplayLink) {
             guard let sv = scrollView else {
                 stopAndNotify()
                 return
             }
 
+            let now = CFAbsoluteTimeGetCurrent()
             let maxOffset = sv.contentSize.height - sv.bounds.height + sv.contentInset.bottom
             guard maxOffset > 0 else { return }
 
             let delta = CGFloat(speed) * 60.0 * CGFloat(link.targetTimestamp - link.timestamp)
-            let newY = min(sv.contentOffset.y + delta, maxOffset)
+            let beforeY = sv.contentOffset.y
+            let newY = min(beforeY + delta, maxOffset)
 
             sv.contentOffset.y = newY
 
+            // Jitter detection
+            let wallDelta = lastTickTime > 0 ? (now - lastTickTime) * 1000 : 0
+            let csChanged = sv.contentSize.height != lastContentSize
+            tickCount += 1
+            if csChanged || wallDelta > 25 || tickCount % 180 == 0 {
+                print("[READER-DBG] \(csChanged || wallDelta > 25 ? "⚠️" : "✅") wallΔ=\(String(format:"%.1f",wallDelta))ms y=\(Int(newY)) csH=\(Int(sv.contentSize.height)) csΔ=\(Int(sv.contentSize.height - lastContentSize)) speed=\(String(format:"%.2f",speed)) dist=\(Int(maxOffset - newY))")
+            }
+            lastTickTime = now
+            lastContentSize = sv.contentSize.height
+
             originalDelegate?.scrollViewDidScroll?(sv)
 
             // Trigger load more when within 500pt of bottom