新增阅读器功能，待优化

lib/providers/app_provider.dart

@@ -9,6 +9,8 @@ import '../utils/movie/movie_poster_dao.dart';
 import '../utils/book/book_review_dao.dart';
 import '../utils/book/book_excerpt_dao.dart';
 import '../utils/tag/tag_dao.dart';
+import '../utils/reader_book_dao.dart';
+import '../models/reader_book.dart';
 import '../utils/database_helper.dart';
 import '../utils/image_path_helper.dart';
 import '../utils/user_prefs.dart';
@@ -25,11 +27,13 @@ class AppProvider extends ChangeNotifier {
   final BookReviewDao _bookReviewDao = BookReviewDao();
   final BookExcerptDao _bookExcerptDao = BookExcerptDao();
   final TagDao _tagDao = TagDao();
+  final ReaderBookDao _readerBookDao = ReaderBookDao();
   
   // 数据列表
   List<Movie> _movies = [];
   List<Book> _books = [];
   List<Note> _notes = [];
+  List<ReaderBook> _readerBooks = [];
   
   // 当前主界面选中的标签 (0: 观影，1: 阅读，2: 笔记)
   int _mainTabIndex = 0;
@@ -60,6 +64,10 @@ class AppProvider extends ChangeNotifier {
   
   // 侧边菜单是否打开
   bool _drawerOpen = false;
+
+  // 回到顶部信号（点击首页图标时递增）
+  int _scrollToTopSignal = 0;
+  int get scrollToTopSignal => _scrollToTopSignal;
   
   // 初始化数据库
   Future<void> initDatabase() async {
@@ -73,10 +81,12 @@ class AppProvider extends ChangeNotifier {
       _movieDao.getAllMovies(),
       _bookDao.getAllBooks(),
       _noteDao.getAllNotes(),
+      _readerBookDao.getAllReaderBooks(),
     ]);
     _movies = results[0] as List<Movie>;
     _books = results[1] as List<Book>;
     _notes = results[2] as List<Note>;
+    _readerBooks = results[3] as List<ReaderBook>;
     debugPrint('[AppProvider] 本地数据: movies=${_movies.length}, books=${_books.length}, notes=${_notes.length}');
     notifyListeners();
   }
@@ -144,6 +154,26 @@ class AppProvider extends ChangeNotifier {
     notifyListeners();
   }
 
+  Future<void> loadReaderBooks() async {
+    _readerBooks = await _readerBookDao.getAllReaderBooks();
+    notifyListeners();
+  }
+
+  Future<void> addReaderBook(ReaderBook book) async {
+    await _readerBookDao.insertReaderBook(book);
+    await loadReaderBooks();
+  }
+
+  Future<void> updateReaderBook(ReaderBook book) async {
+    await _readerBookDao.updateReaderBook(book);
+    await loadReaderBooks();
+  }
+
+  Future<void> removeReaderBook(String id) async {
+    await _readerBookDao.deleteReaderBook(id);
+    await loadReaderBooks();
+  }
+
   // ─── 分页加载（供列表页触底加载使用）────────────────────────
   static const int _pageSize = 20;
 
@@ -179,6 +209,7 @@ class AppProvider extends ChangeNotifier {
   List<Movie> get movies => _movies;
   List<Book> get books => _books;
   List<Note> get notes => _notes;
+  List<ReaderBook> get readerBooks => _readerBooks;
   
   // 根据状态获取影视列表
   List<Movie> getMoviesByStatus(String status) {
@@ -197,8 +228,14 @@ class AppProvider extends ChangeNotifier {
   }
 
   void setBottomNavIndex(int index) {
+    if (index == 0 && _bottomNavIndex == 0) {
+      // 已在首页，再次点击 → 回到顶部
+      _scrollToTopSignal++;
+      notifyListeners();
+      return;
+    }
     _bottomNavIndex = index;
-    _bottomNavVisible = true; // 切换页面时自动显示导航栏
+    _bottomNavVisible = true;
     notifyListeners();
   }