fix: Reader loadMore failing — duplicate IDs + offset drift

ROOT CAUSE (from instrumented logs):
1. Duplicate entry IDs in LazyVStack — loadMore appended entries
   that already existed. IDs 37603/37613 appeared twice, causing
   "undefined results" from SwiftUI.
2. Offset drift — marking entries as read shifted the unread filter
   results. offset=30 no longer pointed to page 2; entries moved.
3. loadMore returned +0 entries because offset was past the shifted
   end of the filtered dataset.

FIXES:
1. Deduplication: loadMore filters out entries whose IDs already
   exist in the array before appending.
2. Use entries.count as offset instead of a separate counter.
   This naturally accounts for deduplication and status changes.
3. hasMore based on whether new (deduped) entries were actually
   added, not just API page size.

Removed all debug logging.

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

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

@@ -72,7 +72,6 @@ final class ReaderViewModel {
         if reset {
             offset = 0
             hasMore = true
-            // DO NOT set entries = [] — causes full list teardown + empty flash
         }
         guard !isLoading else { return }
         isLoading = true
@@ -80,7 +79,7 @@ final class ReaderViewModel {
 
         do {
             let list = try await fetchEntries(offset: 0)
-            // Atomic swap — SwiftUI diffs by Identifiable.id
+            // Atomic swap — fresh list replaces old (no duplicates possible)
             entries = list.entries
             total = list.total
             offset = list.entries.count
@@ -94,19 +93,25 @@ 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)
+            // Use entries.count as offset — accounts for deduplication and
+            // avoids offset drift when entries change status during scroll
+            let list = try await fetchEntries(offset: entries.count)
+
+            if list.entries.isEmpty {
+                hasMore = false
+            } else {
+                // Deduplicate — only append entries with IDs not already in the array
+                let existingIDs = Set(entries.map(\.id))
+                let newEntries = list.entries.filter { !existingIDs.contains($0.id) }
+                entries.append(contentsOf: newEntries)
                 total = list.total
-            offset += count
-            hasMore = offset < list.total
-            print("[READER-DBG] 📥 loadMore END +\(count) total=\(entries.count) hasMore=\(hasMore)")
+                offset = entries.count
+                hasMore = newEntries.count > 0
+            }
         } catch {
             self.error = error.localizedDescription
-            print("[READER-DBG] 📥 loadMore ERROR: \(error)")
         }
         isLoadingMore = false
     }

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

@@ -59,16 +59,12 @@ struct ArticleView: View {
             }
         }
         .task {
-            let t0 = CFAbsoluteTimeGetCurrent()
             let entryId = entry.id
-            print("[READER-DBG] 📄 article OPEN id=\(entryId) initContent=\(articleContent.count)")
-
             if let idx = vm.entries.firstIndex(where: { $0.id == entryId }),
                !vm.entries[idx].isRead {
                 vm.entries[idx].status = "read"
             }
             currentEntry = vm.entries.first(where: { $0.id == entryId }) ?? currentEntry
-            print("[READER-DBG] 📄 markRead done +\(Int((CFAbsoluteTimeGetCurrent()-t0)*1000))ms")
 
             Task {
                 let api = ReaderAPI()
@@ -78,12 +74,10 @@ struct ArticleView: View {
 
             do {
                 let fullEntry = try await ReaderAPI().getEntry(id: entryId)
-                print("[READER-DBG] 📄 getEntry +\(Int((CFAbsoluteTimeGetCurrent()-t0)*1000))ms contentLen=\(fullEntry.articleHTML.count)")
                 let fullHTML = fullEntry.articleHTML
 
                 if !fullHTML.isEmpty && fullHTML.count > articleContent.count {
                     articleContent = fullHTML
-                    print("[READER-DBG] 📄 content upgraded +\(Int((CFAbsoluteTimeGetCurrent()-t0)*1000))ms")
                 }
 
                 var merged = fullEntry
@@ -92,10 +86,7 @@ struct ArticleView: View {
                     merged.starred = local.starred
                 }
                 currentEntry = merged
-                print("[READER-DBG] 📄 article READY +\(Int((CFAbsoluteTimeGetCurrent()-t0)*1000))ms")
-            } catch {
-                print("[READER-DBG] 📄 article FAILED +\(Int((CFAbsoluteTimeGetCurrent()-t0)*1000))ms error=\(error)")
-            }
+            } catch {}
         }
     }
 

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

@@ -100,8 +100,6 @@ struct ArticleWebView: UIViewRepresentable {
 
         // Only reload if content meaningfully changed
         guard context.coordinator.lastHTML != newHTML else { return }
-        print("[READER-DBG] 🌐 webView load htmlLen=\(newHTML.count) isUpgrade=\(context.coordinator.lastHTML != nil)")
-
         let isUpgrade = context.coordinator.lastHTML != nil
         context.coordinator.lastHTML = newHTML
 

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

@@ -123,7 +123,6 @@ 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

@@ -98,36 +98,20 @@ 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 beforeY = sv.contentOffset.y
-            let newY = min(beforeY + delta, maxOffset)
+            let newY = min(sv.contentOffset.y + 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