fix(app): Phase 1.1 紧急修复 — SyncEngine 接入 + authorId + catch 异常处理

- feat(sync): SyncEngine 接入 EditorPage, 保存时 enqueue + 网络恢复自动 trySync
- fix(editor): authorId 从 AuthBloc 获取, 替代硬编码 'local'
- fix(bloc): class_bloc/calendar/profile/parent catch(_).全部改为 debugPrint
- feat(editor): 编辑器工具栏拆分 (brush_panel/tag_panel/text_format_bar/dot_grid_painter)
- feat(editor): EditorBloc 扩展 + EditorPage 增强
- feat(search): SearchBloc 扩展搜索功能
- feat(home): HomeBloc/HomePage 增强
- feat(auth): LoginPage 增强
- feat(templates): TemplateGalleryPage 重构
- fix(web): 管理端班级/日记页面修复
- fix(server): comment_service + theme_handler 修复
- docs: 添加全链路审计报告和验证截图

app/test/features/editor/bloc/editor_bloc_test.dart

@@ -44,8 +44,8 @@ void main() {
 
     // ===== 初始状态 =====
 
-    test('初始状态：pen 工具、空笔画、空元素、非 dirty', () {
-      expect(bloc.state.activeTool, EditorTool.pen);
+    test('初始状态：brush 工具、空笔画、空元素、非 dirty', () {
+      expect(bloc.state.activeTool, EditorTool.brush);
       expect(bloc.state.strokes, isEmpty);
       expect(bloc.state.elements, isEmpty);
       expect(bloc.state.isDirty, isFalse);