refactor(ios): cleanup pass — dead code removal and component consolidation

- Remove dead structs: ReadingProgress, HomeData, PBList (Models.swift)
- Remove unused APIClient members: fetchRaw, setSessionId, BrowseParams; simplify logout(); drop no-op CodingKeys from BrowseResponse
- Remove absolutePrevChapter/absoluteNextChapter computed props (replaced by prevChapter/nextChapter); replace URLSession cover prefetch with Kingfisher
- Drop scrollOffset state var and dead subtitle block in ChapterRow (BookDetailView)
- Remove never-set chaptersLoading published prop (BookDetailViewModel)
- Add unified ChipButton(.filled/.outlined) to CommonViews replacing three near-identical pill chip types
- Replace FilterChipView+SortChip in LibraryView and FilterChip in BrowseView with ChipButton
- Replace inline KFImage usage in HomeView with AsyncCoverImage
- Fix deprecated .navigationBarHidden(true) → .toolbar(.hidden, for: .navigationBar) in AuthView

ios/LibNovel/LibNovel/Views/Auth/AuthView.swift

@@ -96,7 +96,7 @@ struct AuthView: View {
 
                 Spacer()
             }
-            .navigationBarHidden(true)
+            .toolbar(.hidden, for: .navigationBar)
         }
         .onChange(of: mode) { _, _ in
             authStore.error = nil

ios/LibNovel/LibNovel/Views/Browse/BrowseView.swift

@@ -29,13 +29,13 @@ struct BrowseView: View {
                 // Filter chips row
                 ScrollView(.horizontal, showsIndicators: false) {
                     HStack(spacing: 8) {
-                        FilterChip(label: "Sort: \(vm.sort.capitalized)", isActive: vm.sort != "popular") {
+                        ChipButton(label: "Sort: \(vm.sort.capitalized)", isSelected: vm.sort != "popular", style: .outlined) {
                             showFilters = true
                         }
-                        FilterChip(label: "Genre: \(vm.genre == "all" ? "All" : vm.genre.capitalized)", isActive: vm.genre != "all") {
+                        ChipButton(label: "Genre: \(vm.genre == "all" ? "All" : vm.genre.capitalized)", isSelected: vm.genre != "all", style: .outlined) {
                             showFilters = true
                         }
-                        FilterChip(label: "Status: \(vm.status == "all" ? "All" : vm.status.capitalized)", isActive: vm.status != "all") {
+                        ChipButton(label: "Status: \(vm.status == "all" ? "All" : vm.status.capitalized)", isSelected: vm.status != "all", style: .outlined) {
                             showFilters = true
                         }
                     }
@@ -103,25 +103,6 @@ struct BrowseView: View {
     }
 }
 
-// MARK: - Filter chip
-
-private struct FilterChip: View {
-    let label: String
-    let isActive: Bool
-    let action: () -> Void
-    var body: some View {
-        Button(action: action) {
-            Text(label)
-                .font(.caption.bold())
-                .padding(.horizontal, 10)
-                .padding(.vertical, 6)
-                .background(isActive ? Color.amber.opacity(0.15) : Color(.systemGray6), in: Capsule())
-                .foregroundStyle(isActive ? .amber : .primary)
-                .overlay(Capsule().strokeBorder(isActive ? Color.amber : .clear, lineWidth: 1))
-        }
-    }
-}
-
 // MARK: - Browse card
 
 private struct BrowseCard: View {

ios/LibNovel/LibNovel/Views/Home/HomeView.swift

@@ -1,5 +1,4 @@
 import SwiftUI
-import Kingfisher
 
 struct HomeView: View {
     @StateObject private var vm = HomeViewModel()
@@ -100,9 +99,7 @@ private struct HeroContinueCard: View {
         NavigationLink(value: NavDestination.chapter(item.book.slug, item.chapter)) {
             ZStack(alignment: .bottomLeading) {
                 // Blurred background
-                KFImage(URL(string: item.book.cover))
-                    .resizable()
-                    .scaledToFill()
+                AsyncCoverImage(url: item.book.cover, isBackground: true)
                     .frame(maxWidth: .infinity)
                     .frame(height: 220)
                     .blur(radius: 22)
@@ -122,13 +119,7 @@ private struct HeroContinueCard: View {
 
                 // Content: cover on left, info stacked on right
                 HStack(alignment: .bottom, spacing: 14) {
-                    KFImage(URL(string: item.book.cover))
-                        .resizable()
-                        .placeholder {
-                            RoundedRectangle(cornerRadius: 10)
-                                .fill(Color(.systemGray5))
-                        }
-                        .scaledToFill()
+                    AsyncCoverImage(url: item.book.cover)
                         .frame(width: 96, height: 138)
                         .clipShape(RoundedRectangle(cornerRadius: 10))
                         .shadow(color: .black.opacity(0.55), radius: 12, y: 6)
@@ -215,14 +206,7 @@ private struct ContinueReadingCard: View {
     var body: some View {
         VStack(alignment: .leading, spacing: 6) {
             ZStack(alignment: .bottomTrailing) {
-                KFImage(URL(string: item.book.cover))
-                    .resizable()
-                    .placeholder {
-                        RoundedRectangle(cornerRadius: 8)
-                            .fill(Color(.systemGray5))
-                            .overlay(Image(systemName: "book.closed").foregroundStyle(.secondary))
-                    }
-                    .scaledToFill()
+                AsyncCoverImage(url: item.book.cover)
                     .frame(width: 110, height: 158)
                     .clipShape(RoundedRectangle(cornerRadius: 8))
 
@@ -258,14 +242,7 @@ private struct ShelfBookCard: View {
 
     var body: some View {
         VStack(alignment: .leading, spacing: 6) {
-            KFImage(URL(string: book.cover))
-                .resizable()
-                .placeholder {
-                    RoundedRectangle(cornerRadius: 8)
-                        .fill(Color(.systemGray5))
-                        .overlay(Image(systemName: "book.closed").foregroundStyle(.secondary))
-                }
-                .scaledToFill()
+            AsyncCoverImage(url: book.cover)
                 .frame(width: 110, height: 158)
                 .clipShape(RoundedRectangle(cornerRadius: 8))
                 .shadow(color: .black.opacity(0.12), radius: 4, y: 2)

ios/LibNovel/LibNovel/Views/Library/LibraryView.swift

@@ -235,56 +235,6 @@ struct LibraryView: View {
     }
 }
 
-// MARK: - Genre filter chip
-
-private struct FilterChipView: View {
-    let label: String
-    let isSelected: Bool
-    let action: () -> Void
-
-    var body: some View {
-        Button(action: action) {
-            Text(label)
-                .font(.caption.weight(isSelected ? .semibold : .regular))
-                .padding(.horizontal, 12)
-                .padding(.vertical, 6)
-                .background(
-                    Capsule()
-                        .fill(isSelected ? Color.amber : Color(.systemGray5))
-                )
-                .foregroundStyle(isSelected ? .white : .primary)
-        }
-        .buttonStyle(.plain)
-    }
-}
-
-// MARK: - Sort chip
-
-private struct SortChip: View {
-    let label: String
-    let isSelected: Bool
-    let action: () -> Void
-
-    var body: some View {
-        Button(action: action) {
-            Text(label)
-                .font(.subheadline.weight(isSelected ? .semibold : .regular))
-                .padding(.horizontal, 14)
-                .padding(.vertical, 6)
-                .background(
-                    Capsule()
-                        .fill(isSelected ? Color.amber.opacity(0.15) : Color(.systemGray6))
-                        .overlay(
-                            Capsule()
-                                .stroke(isSelected ? Color.amber : .clear, lineWidth: 1.5)
-                        )
-                )
-                .foregroundStyle(isSelected ? .amber : .primary)
-        }
-        .buttonStyle(.plain)
-    }
-}
-
 // MARK: - Library book card (3-column)
 
 private struct LibraryBookCard: View {

ios/LibNovel/LibNovel/Views/Player/PlayerViews.swift

@@ -47,7 +47,7 @@ struct MiniPlayerView: View {
                     // Previous chapter button
                     if audioPlayer.status == .ready {
                         Button { 
-                            if let prev = audioPlayer.absolutePrevChapter {
+                            if let prev = audioPlayer.prevChapter {
                                 NotificationCenter.default.post(
                                     name: .skipToPrevChapter,
                                     object: nil,
@@ -62,8 +62,8 @@ struct MiniPlayerView: View {
                                 .contentShape(Rectangle())
                         }
                         .buttonStyle(.plain)
-                        .disabled(audioPlayer.absolutePrevChapter == nil)
-                        .opacity(audioPlayer.absolutePrevChapter == nil ? 0.4 : 1.0)
+                        .disabled(audioPlayer.prevChapter == nil)
+                        .opacity(audioPlayer.prevChapter == nil ? 0.4 : 1.0)
                     }
                     
                     // Status indicator or play/pause control
@@ -92,7 +92,7 @@ struct MiniPlayerView: View {
                     // Next chapter button
                     if audioPlayer.status == .ready {
                         Button { 
-                            if let next = audioPlayer.absoluteNextChapter {
+                            if let next = audioPlayer.nextChapter {
                                 NotificationCenter.default.post(
                                     name: .skipToNextChapter,
                                     object: nil,
@@ -124,8 +124,8 @@ struct MiniPlayerView: View {
                             .contentShape(Rectangle())
                         }
                         .buttonStyle(.plain)
-                        .disabled(audioPlayer.absoluteNextChapter == nil)
-                        .opacity(audioPlayer.absoluteNextChapter == nil ? 0.4 : 1.0)
+                        .disabled(audioPlayer.nextChapter == nil)
+                        .opacity(audioPlayer.nextChapter == nil ? 0.4 : 1.0)
                     }
                 }
             }
@@ -342,9 +342,9 @@ struct FullPlayerView: View {
                         PlayerChapterSkipButton(
                             systemName: "backward.end.fill",
                             size: 30,
-                            disabled: audioPlayer.absolutePrevChapter == nil
+                            disabled: audioPlayer.prevChapter == nil
                         ) {
-                            if let prev = audioPlayer.absolutePrevChapter {
+                            if let prev = audioPlayer.prevChapter {
                                 onDismiss()
                                 NotificationCenter.default.post(
                                     name: .skipToPrevChapter, object: nil,
@@ -364,10 +364,10 @@ struct FullPlayerView: View {
                         PlayerChapterSkipButton(
                             systemName: "forward.end.fill",
                             size: 30,
-                            disabled: audioPlayer.absoluteNextChapter == nil,
+                            disabled: audioPlayer.nextChapter == nil,
                             prefetching: audioPlayer.nextPrefetchStatus == .prefetching
                         ) {
-                            if let next = audioPlayer.absoluteNextChapter {
+                            if let next = audioPlayer.nextChapter {
                                 onDismiss()
                                 NotificationCenter.default.post(
                                     name: .skipToNextChapter, object: nil,