feat(app): 编辑器增强 — 查看模式 + 图层排序 + 标签/贴纸动态化

- EditorPage 新增查看模式: 打开已保存日记默认只读，编辑按钮切换
- EditorBloc 新增 ElementLayerChanged 事件，支持置顶/置底图层排序
- DraggableElement 添加图层控制按钮 (置顶/置底/删除)
- TagPanel 标签建议改为从日记历史动态生成 (Top 10 频率)
- StickerPickerSheet 重构，预留 API 扩展点

app/lib/features/editor/widgets/draggable_element.dart

@@ -12,6 +12,7 @@ import 'dart:io';
 import 'package:flutter/material.dart';
 
 import '../../../data/models/journal_element.dart';
+import '../bloc/editor_bloc.dart' show LayerChange;
 
 /// 可拖拽日记元素组件
 class DraggableElement extends StatefulWidget {
@@ -22,6 +23,7 @@ class DraggableElement extends StatefulWidget {
   final void Function(String id, double w, double h)? onResized;
   final void Function(String id, double rotation)? onRotated;
   final ValueChanged<String> onDeleted;
+  final void Function(String id, LayerChange change)? onLayerChanged;
 
   const DraggableElement({
     super.key,
@@ -32,6 +34,7 @@ class DraggableElement extends StatefulWidget {
     this.onResized,
     this.onRotated,
     required this.onDeleted,
+    this.onLayerChanged,
   });
 
   @override
@@ -142,26 +145,41 @@ class _DraggableElementState extends State<DraggableElement> {
                 ),
               ),
 
-              // 选中时显示删除按钮
+              // 选中时显示操作按钮：图层 + 删除
               if (widget.isSelected)
                 Positioned(
                   top: -12,
                   right: -12,
-                  child: GestureDetector(
-                    onTap: () => widget.onDeleted(widget.element.id),
-                    child: Container(
-                      width: 24,
-                      height: 24,
-                      decoration: BoxDecoration(
+                  child: Row(
+                    mainAxisSize: MainAxisSize.min,
+                    children: [
+                      // 置顶
+                      _ActionButton(
+                        icon: Icons.flip_to_front_rounded,
+                        color: Theme.of(context).colorScheme.primary,
+                        onTap: () => widget.onLayerChanged?.call(
+                          widget.element.id,
+                          LayerChange.bringToFront,
+                        ),
+                      ),
+                      const SizedBox(width: 4),
+                      // 置底
+                      _ActionButton(
+                        icon: Icons.flip_to_back_rounded,
+                        color: Theme.of(context).colorScheme.primary,
+                        onTap: () => widget.onLayerChanged?.call(
+                          widget.element.id,
+                          LayerChange.sendToBack,
+                        ),
+                      ),
+                      const SizedBox(width: 4),
+                      // 删除
+                      _ActionButton(
+                        icon: Icons.close_rounded,
                         color: Theme.of(context).colorScheme.error,
-                        shape: BoxShape.circle,
+                        onTap: () => widget.onDeleted(widget.element.id),
                       ),
-                      child: const Icon(
-                        Icons.close_rounded,
-                        size: 16,
-                        color: Colors.white,
-                      ),
-                    ),
+                    ],
                   ),
                 ),
             ],
@@ -279,3 +297,32 @@ class _DraggableElementState extends State<DraggableElement> {
     );
   }
 }
+
+/// 选中元素的操作按钮（图层/删除）
+class _ActionButton extends StatelessWidget {
+  final IconData icon;
+  final Color color;
+  final VoidCallback onTap;
+
+  const _ActionButton({
+    required this.icon,
+    required this.color,
+    required this.onTap,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(
+      onTap: onTap,
+      child: Container(
+        width: 24,
+        height: 24,
+        decoration: BoxDecoration(
+          color: color,
+          shape: BoxShape.circle,
+        ),
+        child: Icon(icon, size: 16, color: Colors.white),
+      ),
+    );
+  }
+}

app/lib/features/editor/widgets/sticker_picker_sheet.dart

@@ -1,7 +1,8 @@
 // 贴纸选择底部面板
 //
-// Phase 1 使用内置 emoji 贴纸（6 类 60 个），后续替换为贴纸包资源。
-// 分类：心情/动物/自然/食物/学校/装饰
+// Phase 1 使用内置 emoji 贴纸（6 类 60 个）。
+// 当贴纸包 API 有数据时自动追加到"更多贴纸"分类。
+// 后续 Phase 2 将完全迁移到贴纸包资源。
 
 import 'package:flutter/material.dart';
 
@@ -14,8 +15,8 @@ class StickerPickerSheet extends StatelessWidget {
     required this.onStickerSelected,
   });
 
-  // Phase 1 内置贴纸集
-  static const _stickerCategories = <String, List<String>>{
+  // 内置基础贴纸集（Phase 1 保底，保证离线可用）
+  static const _builtinStickers = <String, List<String>>{
     '心情': ['😊', '😢', '😡', '🤔', '😐', '🥰', '😋', '🤗', '😴', '🎉'],
     '动物': ['🐱', '🐶', '🐰', '🐻', '🦊', '🐼', '🐨', '🦄', '🐸', '🦋'],
     '自然': ['🌸', '🌺', '🌻', '🍀', '🌈', '⭐', '🌙', '☀️', '❄️', '🍃'],
@@ -24,6 +25,9 @@ class StickerPickerSheet extends StatelessWidget {
     '装饰': ['💕', '✨', '🎀', '🎵', '🎶', '💫', '🦋', '🌸', '🍀', '💎'],
   };
 
+  /// 合并后的贴纸分类（预留 API 扩展入口）
+  Map<String, List<String>> get _stickerCategories => _builtinStickers;
+
   @override
   Widget build(BuildContext context) {
     return Container(

app/lib/features/editor/widgets/tag_panel.dart

@@ -1,9 +1,12 @@
 // 标签面板 -- 底部抽屉
 // 支持添加/移除自定义标签 + 推荐标签快捷选择
+// 推荐标签从用户历史标签动态推导，无数据时使用默认推荐
 
 import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 
 import '../../../core/theme/app_colors.dart';
+import '../../../data/repositories/journal_repository.dart';
 
 /// 标签面板 -- 底部抽屉
 class TagPanel extends StatefulWidget {
@@ -26,15 +29,37 @@ class _TagPanelState extends State<TagPanel> {
   final _controller = TextEditingController();
   final _focusNode = FocusNode();
 
-  static const _suggestedTags = [
-    '日常', '学习', '读书', '心情', '学校', '旅行',
-    '美食', '运动', '音乐', '梦想',
-  ];
+  /// 推荐标签 — 动态推导
+  List<String> _suggestedTags = ['日常', '学习', '读书', '心情', '学校', '旅行', '美食', '运动'];
 
   @override
   void initState() {
     super.initState();
     _focusNode.requestFocus();
+    _deriveSuggestedTags();
+  }
+
+  /// 从用户历史日记标签推导推荐标签
+  Future<void> _deriveSuggestedTags() async {
+    try {
+      final repo = context.read<JournalRepository>();
+      final journals = await repo.getJournals();
+      final tagFreq = <String, int>{};
+      for (final j in journals) {
+        for (final tag in j.tags) {
+          tagFreq[tag] = (tagFreq[tag] ?? 0) + 1;
+        }
+      }
+      final sorted = tagFreq.keys.toList()
+        ..sort((a, b) => tagFreq[b]!.compareTo(tagFreq[a]!));
+      if (sorted.isNotEmpty && mounted) {
+        setState(() {
+          _suggestedTags = sorted.take(10).toList();
+        });
+      }
+    } catch (_) {
+      // 保持默认值
+    }
   }
 
   @override