编辑界面优化

lib/pages/book/book_detail_page.dart

@@ -110,12 +110,15 @@ class _BookDetailPageState extends State<BookDetailPage> {
   
   /// 构建右下角悬浮按钮组
   Widget _buildFloatingActionButtons(Book book) {
-    final hasCover = book.coverPath != null && book.coverPath!.isNotEmpty;
-    
     return Column(
       mainAxisSize: MainAxisSize.min,
       children: [
-        // 删除按钮
+        _buildFloatingButton(
+          icon: Icons.edit_outlined,
+          onPressed: () => _navigateToEdit(context),
+          tooltip: '编辑',
+        ),
+        const SizedBox(height: 12),
         _buildFloatingButton(
           icon: Icons.delete_outline,
           onPressed: () => _showDeleteDialog(context),
@@ -123,23 +126,6 @@ class _BookDetailPageState extends State<BookDetailPage> {
           backgroundColor: Colors.red,
         ),
         const SizedBox(height: 12),
-        // 清空封面按钮（仅当有封面时显示）
-        if (hasCover) ...[
-          _buildFloatingButton(
-            icon: Icons.hide_image_outlined,
-            onPressed: () => _showClearCoverDialog(book),
-            tooltip: '清空封面',
-          ),
-          const SizedBox(height: 12),
-        ],
-        // 编辑按钮
-        _buildFloatingButton(
-          icon: Icons.edit_outlined,
-          onPressed: () => _navigateToEdit(context),
-          tooltip: '编辑',
-        ),
-        const SizedBox(height: 12),
-        // 分享按钮
         _buildFloatingButton(
           icon: Icons.share_outlined,
           onPressed: () => _showSharePoster(book),
@@ -796,67 +782,6 @@ class _BookDetailPageState extends State<BookDetailPage> {
     );
   }
 
-  /// 显示清空封面对话框
-  void _showClearCoverDialog(Book book) {
-    showDialog(
-      context: context,
-      builder: (context) => AlertDialog(
-        backgroundColor: Colors.white,
-        elevation: 0,
-        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
-        title: const Text(
-          '清空封面',
-          style: TextStyle(
-            fontSize: 18,
-            fontWeight: FontWeight.w600,
-          ),
-        ),
-        content: const Text(
-          '确定要清空封面吗？清空后将使用默认占位图。',
-          style: TextStyle(
-            fontSize: 14,
-            color: Color(0xFF666666),
-            height: 1.5,
-          ),
-        ),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.pop(context),
-            style: TextButton.styleFrom(
-              foregroundColor: const Color(0xFF666666),
-              padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
-            ),
-            child: const Text('取消'),
-          ),
-          ElevatedButton(
-            onPressed: () async {
-              Navigator.pop(context);
-              final updatedBook = book.copyWith(
-                coverPath: null,
-                updatedAt: DateTime.now(),
-              );
-              await context.read<AppProvider>().updateBook(updatedBook);
-              if (mounted) {
-                ToastUtil.show(context, '封面已清空');
-              }
-            },
-            style: ElevatedButton.styleFrom(
-              backgroundColor: Colors.red,
-              foregroundColor: Colors.white,
-              elevation: 0,
-              shape: RoundedRectangleBorder(
-                borderRadius: BorderRadius.circular(8),
-              ),
-              padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
-            ),
-            child: const Text('清空'),
-          ),
-        ],
-        actionsPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
-      ),
-    );
-  }
-
   /// 下载封面到本地
   Future<void> _downloadCover(Book book) async {
     if (book.coverPath == null || book.coverPath!.isEmpty) {