iOS: add chapters list sheet to full player

- List bullet button now opens a chapters list sheet
- ChaptersListSheet displays all chapters with scroll view
- Current chapter highlighted with amber badge and background
- Auto-scrolls to current chapter when opened
- Chapter selection uses skip notifications to navigate
- Supports both .medium and .large presentation sizes
- Shows "Now Playing" label on current chapter
- Clean list design with chapter numbers and titles

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

@@ -190,6 +190,7 @@ struct FullPlayerView: View {
     @State private var isFavorited = false
     @State private var isLiked = false
     @State private var showingSpeedMenu = false
+    @State private var showingChaptersList = false
 
     var body: some View {
         ZStack {
@@ -515,14 +516,15 @@ struct FullPlayerView: View {
                     .disabled(true)
                     
                     // Queue (show chapters list)
-                    Button {} label: {
+                    Button {
+                        showingChaptersList = true
+                    } label: {
                         Image(systemName: "list.bullet")
                             .font(.system(size: 22))
                             .foregroundStyle(.white.opacity(0.7))
                             .frame(maxWidth: .infinity)
                     }
                     .buttonStyle(.plain)
-                    .disabled(true)
                     
                     // Sleep timer (placeholder)
                     Button {} label: {
@@ -538,6 +540,31 @@ struct FullPlayerView: View {
                 .padding(.bottom, 24)
             }
         }
+        .sheet(isPresented: $showingChaptersList) {
+            ChaptersListSheet(
+                chapters: audioPlayer.chapters,
+                currentChapter: audioPlayer.chapter,
+                onChapterSelect: { selectedChapter in
+                    showingChaptersList = false
+                    // Post notification to navigate to selected chapter
+                    if selectedChapter > audioPlayer.chapter {
+                        NotificationCenter.default.post(
+                            name: .skipToNextChapter,
+                            object: nil,
+                            userInfo: ["next": selectedChapter]
+                        )
+                    } else if selectedChapter < audioPlayer.chapter {
+                        NotificationCenter.default.post(
+                            name: .skipToPrevChapter,
+                            object: nil,
+                            userInfo: ["prev": selectedChapter]
+                        )
+                    }
+                }
+            )
+            .presentationDetents([.medium, .large])
+            .presentationDragIndicator(.visible)
+        }
     }
 
     private func formatTime(_ seconds: Double) -> String {
@@ -575,6 +602,92 @@ struct FullPlayerView: View {
     }
 }
 
+// MARK: - Chapters List Sheet
+
+struct ChaptersListSheet: View {
+    let chapters: [ChapterIndexBrief]
+    let currentChapter: Int
+    let onChapterSelect: (Int) -> Void
+    
+    @Environment(\.dismiss) private var dismiss
+    
+    var body: some View {
+        NavigationStack {
+            ScrollViewReader { proxy in
+                List {
+                    ForEach(chapters, id: \.number) { chapter in
+                        Button {
+                            onChapterSelect(chapter.number)
+                        } label: {
+                            HStack(spacing: 12) {
+                                // Chapter number badge
+                                Text("\(chapter.number)")
+                                    .font(.caption.bold())
+                                    .foregroundStyle(chapter.number == currentChapter ? .white : .secondary)
+                                    .frame(width: 44, height: 44)
+                                    .background(
+                                        Circle()
+                                            .fill(chapter.number == currentChapter ? Color.amber : Color.gray.opacity(0.2))
+                                    )
+                                
+                                // Chapter title
+                                VStack(alignment: .leading, spacing: 4) {
+                                    Text(chapter.title.strippingTrailingDate())
+                                        .font(.subheadline.weight(chapter.number == currentChapter ? .semibold : .regular))
+                                        .foregroundStyle(chapter.number == currentChapter ? .primary : .primary)
+                                        .lineLimit(2)
+                                    
+                                    if chapter.number == currentChapter {
+                                        Text("Now Playing")
+                                            .font(.caption2)
+                                            .foregroundStyle(.amber)
+                                    }
+                                }
+                                
+                                Spacer()
+                                
+                                // Checkmark for current chapter
+                                if chapter.number == currentChapter {
+                                    Image(systemName: "checkmark")
+                                        .font(.caption.bold())
+                                        .foregroundStyle(.amber)
+                                }
+                            }
+                            .padding(.vertical, 8)
+                        }
+                        .buttonStyle(.plain)
+                        .listRowBackground(
+                            chapter.number == currentChapter
+                                ? Color.amber.opacity(0.1)
+                                : Color.clear
+                        )
+                        .id(chapter.number)
+                    }
+                }
+                .listStyle(.plain)
+                .onAppear {
+                    // Scroll to current chapter on appear
+                    DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
+                        withAnimation {
+                            proxy.scrollTo(currentChapter, anchor: .center)
+                        }
+                    }
+                }
+            }
+            .navigationTitle("Chapters")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .topBarTrailing) {
+                    Button("Done") {
+                        dismiss()
+                    }
+                    .fontWeight(.semibold)
+                }
+            }
+        }
+    }
+}
+
 // MARK: - Custom seek slider
 // A thicker, rounded-thumb slider that matches the amber design language.