fix(app): 修复 4 个 Flutter 交互问题

1. 首页数据不刷新 — JournalRepository 添加 onJournalChanged
   Stream 变更通知，HomeBloc 订阅后自动刷新
2. 画笔再次点击不弹出面板 — 添加 ToolReactivated 事件，
   工具栏检测已激活工具时发出重新激活信号
3. 钢笔铅笔效果一样 — 调整 perfect_freehand 参数
   (pen: size 10/smooth 0.65, pencil: size 3/smooth 0.35)
4. 橡皮擦不生效 — ActiveStrokePainter 橡皮擦模式绘制
   半透明灰色反馈，笔画完成后 setState 触发 Layer 1 重绘
5. 贴纸文字无法缩放 — DraggableElement 用 Scale 手势
   替换 Pan 手势，支持双指缩放和旋转

app/lib/data/repositories/isar_journal_repository_native.dart

@@ -7,6 +7,7 @@
 // - JournalEntry ↔ JournalEntryCollection（通过 toCollection/fromCollection）
 // - JournalElement ↔ JournalElementCollection（通过 toCollection/fromCollection）
 
+import 'dart:async';
 import 'dart:convert';
 
 import 'package:isar/isar.dart';
@@ -22,6 +23,11 @@ import 'journal_repository.dart';
 class IsarJournalRepository implements JournalRepository {
   Isar get _isar => IsarDatabase.instance;
 
+  final StreamController<void> _changeController = StreamController<void>.broadcast();
+
+  @override
+  Stream<void> get onJournalChanged => _changeController.stream;
+
   // ============================================================
   // 日记 CRUD
   // ============================================================
@@ -107,6 +113,7 @@ class IsarJournalRepository implements JournalRepository {
     await _isar.writeTxn(() async {
       await _isar.journalEntryCollections.put(col);
     });
+    _changeController.add(null);
     return entry;
   }
 
@@ -143,6 +150,7 @@ class IsarJournalRepository implements JournalRepository {
       await _isar.journalEntryCollections.put(col);
     });
 
+    _changeController.add(null);
     return updated;
   }
 
@@ -176,6 +184,7 @@ class IsarJournalRepository implements JournalRepository {
         await _isar.journalElementCollections.put(el);
       }
     });
+    _changeController.add(null);
   }
 
   // ============================================================

app/lib/data/repositories/isar_journal_repository_web.dart

@@ -7,6 +7,9 @@ import '../models/journal_entry.dart';
 import '../models/journal_element.dart';
 import 'journal_repository.dart';
 
+/// 空的变更通知流 — Web 平台 stub
+const _emptyStream = Stream<void>.empty();
+
 /// Isar 本地日记仓库 — Web 空实现（抛出 UnsupportedError）
 class IsarJournalRepository implements JournalRepository {
   @override
@@ -56,4 +59,7 @@ class IsarJournalRepository implements JournalRepository {
   @override
   Future<void> removeElement(String elementId) =>
       throw UnsupportedError('IsarJournalRepository 不支持 Web 平台');
+
+  @override
+  Stream<void> get onJournalChanged => _emptyStream;
 }

app/lib/data/repositories/journal_repository.dart

@@ -6,6 +6,8 @@
 // - SyncEngine 负责协调本地和远程仓库之间的数据同步
 // - 内存实现 [InMemoryJournalRepository] 用于开发阶段快速迭代
 
+import 'dart:async';
+
 import '../models/journal_entry.dart';
 import '../models/journal_element.dart';
 
@@ -52,6 +54,9 @@ abstract class JournalRepository {
 
   /// 从日记中移除元素
   Future<void> removeElement(String elementId);
+
+  /// 日记变更通知流 — create/update/delete 时发出信号
+  Stream<void> get onJournalChanged;
 }
 
 /// 内存实现 — 用于开发阶段快速迭代和单元测试
@@ -61,6 +66,10 @@ abstract class JournalRepository {
 class InMemoryJournalRepository implements JournalRepository {
   final Map<String, JournalEntry> _journals = {};
   final Map<String, JournalElement> _elements = {};
+  final StreamController<void> _changeController = StreamController<void>.broadcast();
+
+  @override
+  Stream<void> get onJournalChanged => _changeController.stream;
 
   @override
   Future<List<JournalEntry>> getJournals({
@@ -122,6 +131,7 @@ class InMemoryJournalRepository implements JournalRepository {
   @override
   Future<JournalEntry> createJournal(JournalEntry entry) async {
     _journals[entry.id] = entry;
+    _changeController.add(null);
     return entry;
   }
 
@@ -145,6 +155,7 @@ class InMemoryJournalRepository implements JournalRepository {
       updatedAt: DateTime.now(),
     );
     _journals[entry.id] = updated;
+    _changeController.add(null);
     return updated;
   }
 
@@ -154,6 +165,7 @@ class InMemoryJournalRepository implements JournalRepository {
     _journals.remove(id);
     // 同时移除关联元素
     _elements.removeWhere((_, e) => e.journalId == id);
+    _changeController.add(null);
   }
 
   @override

app/lib/data/repositories/remote_journal_repository.dart

@@ -131,6 +131,10 @@ class RemoteJournalRepository implements JournalRepository {
   Future<void> removeElement(String elementId) async {
     await _api.delete('/diary/elements/$elementId');
   }
+
+  /// 远程仓库不提供本地变更通知，返回空流
+  @override
+  Stream<void> get onJournalChanged => const Stream<void>.empty();
 }
 
 /// API 异常封装 — 后端返回非 2xx 状态码时抛出

app/lib/features/editor/bloc/editor_bloc.dart

@@ -107,6 +107,12 @@ class ToolChanged extends EditorEvent {
   ToolChanged(this.tool);
 }
 
+/// 再次点击已激活的工具 — 重新弹出设置面板
+class ToolReactivated extends EditorEvent {
+  final EditorTool tool;
+  ToolReactivated(this.tool);
+}
+
 /// 加载已有元素
 class ElementsLoaded extends EditorEvent {
   final List<JournalElement> elements;
@@ -227,6 +233,9 @@ class EditorState {
   final bool isDirty;
   final DateTime? lastSavedAt;
 
+  // 工具重新激活时间戳（用于驱动面板重新弹出）
+  final int toolReactivatedAt;
+
   const EditorState({
     this.strokes = const [],
     this.redoStack = const [],
@@ -243,6 +252,7 @@ class EditorState {
     this.title = '',
     this.isDirty = false,
     this.lastSavedAt,
+    this.toolReactivatedAt = 0,
   });
 
   EditorState copyWith({
@@ -261,6 +271,7 @@ class EditorState {
     String? title,
     bool? isDirty,
     DateTime? lastSavedAt,
+    int? toolReactivatedAt,
   }) =>
       EditorState(
         strokes: strokes ?? this.strokes,
@@ -279,6 +290,7 @@ class EditorState {
         title: title ?? this.title,
         isDirty: isDirty ?? this.isDirty,
         lastSavedAt: lastSavedAt ?? this.lastSavedAt,
+        toolReactivatedAt: toolReactivatedAt ?? this.toolReactivatedAt,
       );
 
   /// 是否处于手写模式
@@ -330,6 +342,7 @@ class EditorBloc extends Bloc<EditorEvent, EditorState> {
 
     // 工具栏事件
     on<ToolChanged>(_onToolChanged);
+    on<ToolReactivated>(_onToolReactivated);
 
     // 标签/心情/标题事件
     on<TagAdded>(_onTagAdded);
@@ -514,6 +527,13 @@ class EditorBloc extends Bloc<EditorEvent, EditorState> {
     ));
   }
 
+  void _onToolReactivated(ToolReactivated event, Emitter<EditorState> emit) {
+    // 不改变 activeTool，仅递增时间戳驱动 UI 层重新弹出面板
+    emit(state.copyWith(
+      toolReactivatedAt: DateTime.now().millisecondsSinceEpoch,
+    ));
+  }
+
   // ============================================================
   // 标签/心情/标题事件处理
   // ============================================================

app/lib/features/editor/views/editor_page.dart

@@ -625,6 +625,7 @@ class _EditorStack extends StatefulWidget {
 
 class _EditorStackState extends State<_EditorStack> {
   EditorTool? _lastTool;
+  int _lastReactivatedAt = 0;
   late final TextEditingController _titleController;
 
   @override
@@ -675,6 +676,26 @@ class _EditorStackState extends State<_EditorStack> {
       });
     }
     _lastTool = currentTool;
+
+    // 工具重新激活（再次点击已选中的工具）→ 重新弹出面板
+    final reactivatedAt = widget.state.toolReactivatedAt;
+    if (reactivatedAt != _lastReactivatedAt) {
+      _lastReactivatedAt = reactivatedAt;
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        if (!mounted) return;
+
+        switch (currentTool) {
+          case EditorTool.brush:
+            _showBrushPanel();
+          case EditorTool.sticker:
+            _showStickerPicker();
+          case EditorTool.more:
+            _showMoreSheet();
+          default:
+            break;
+        }
+      });
+    }
   }
 
   /// 显示贴纸选择底部面板
@@ -962,6 +983,19 @@ class _EditorStackState extends State<_EditorStack> {
               positionY: y,
             ));
           },
+          onResized: (id, w, h) {
+            context.read<EditorBloc>().add(ElementResized(
+              elementId: id,
+              width: w,
+              height: h,
+            ));
+          },
+          onRotated: (id, r) {
+            context.read<EditorBloc>().add(ElementRotated(
+              elementId: id,
+              rotation: r,
+            ));
+          },
           onDeleted: (id) {
             context.read<EditorBloc>().add(ElementRemoved(id));
           },

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

@@ -53,6 +53,16 @@ class ActiveStrokePainter extends CustomPainter {
 
     final path = buildStrokePath(outlinePoints);
 
+    // 橡皮擦实时反馈：绘制半透明灰色，让用户看到擦除范围
+    // 实际擦除在笔画完成后的合成图中通过 BlendMode.dstOut 执行
+    if (brushType == BrushType.eraser) {
+      canvas.drawPath(path, Paint()
+        ..color = const Color(0x40808080) // 25% 灰色
+        ..style = PaintingStyle.fill
+        ..isAntiAlias = true);
+      return;
+    }
+
     // 构造临时 Stroke 用于获取 Paint
     final stroke = Stroke(
       id: '__active__',

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

@@ -19,6 +19,8 @@ class DraggableElement extends StatefulWidget {
   final bool isSelected;
   final ValueChanged<String> onTap;
   final void Function(String id, double x, double y) onMoved;
+  final void Function(String id, double w, double h)? onResized;
+  final void Function(String id, double rotation)? onRotated;
   final ValueChanged<String> onDeleted;
 
   const DraggableElement({
@@ -27,6 +29,8 @@ class DraggableElement extends StatefulWidget {
     this.isSelected = false,
     required this.onTap,
     required this.onMoved,
+    this.onResized,
+    this.onRotated,
     required this.onDeleted,
   });
 
@@ -41,6 +45,11 @@ class _DraggableElementState extends State<DraggableElement> {
   late double _height;
   late double _rotation;
 
+  // Scale 手势状态
+  double _baseWidth = 0;
+  double _baseHeight = 0;
+  double _baseRotation = 0;
+
   @override
   void initState() {
     super.initState();
@@ -76,15 +85,35 @@ class _DraggableElementState extends State<DraggableElement> {
       child: Transform.rotate(
         angle: _rotation,
         child: GestureDetector(
-          // 拖拽移动
+          // 缩放开始 — 记录基准值
-          onPanUpdate: (details) {
+          onScaleStart: (details) {
+            _baseWidth = _width;
+            _baseHeight = _height;
+            _baseRotation = _rotation;
+          },
+          // 缩放更新 — 支持单指拖拽 + 双指缩放/旋转
+          onScaleUpdate: (details) {
             setState(() {
-              _x += details.delta.dx;
+              // 拖拽（单指和双指都支持）
-              _y += details.delta.dy;
+              _x += details.focalPointDelta.dx;
+              _y += details.focalPointDelta.dy;
+
+              // 双指缩放 + 旋转
+              if (details.pointerCount >= 2) {
+                final newW = (_baseWidth * details.scale).clamp(40.0, 400.0);
+                final newH = (_baseHeight * details.scale).clamp(40.0, 400.0);
+                _width = newW;
+                _height = newH;
+                _rotation = _baseRotation + details.rotation;
+              }
             });
             widget.onMoved(widget.element.id, _x, _y);
+            if (details.pointerCount >= 2) {
+              widget.onResized?.call(widget.element.id, _width, _height);
+              widget.onRotated?.call(widget.element.id, _rotation);
+            }
           },
-          onPanEnd: (_) {
+          onScaleEnd: (_) {
             // 确保最终位置已通知
             widget.onMoved(widget.element.id, _x, _y);
           },

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

@@ -68,7 +68,7 @@ class EditorToolbar extends StatelessWidget {
     final colorScheme = Theme.of(context).colorScheme;
 
     return GestureDetector(
-      onTap: () => onEvent(ToolChanged(tool)),
+      onTap: () => onEvent(isActive ? ToolReactivated(tool) : ToolChanged(tool)),
       behavior: HitTestBehavior.opaque,
       child: Container(
         constraints: const BoxConstraints(minWidth: 36, minHeight: 36),

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

@@ -235,7 +235,10 @@ class _HandwritingCanvasState extends State<HandwritingCanvas> {
     widget.onStrokeCompleted?.call(stroke);
 
     // 光栅化新笔画到缓存（异步，不阻塞 UI）
-    _cache.addStroke(stroke);
+    // 完成后 setState 确保 Layer 1 (CachedStrokesPainter) 用新合成图重绘
+    _cache.addStroke(stroke).then((_) {
+      if (mounted) setState(() {});
+    });
   }
 
   /// 指针取消（如来电打断）：丢弃当前笔画。

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

@@ -39,19 +39,21 @@ class _BrushConfig {
 
 /// 各画笔的渲染参数。
 const Map<BrushType, _BrushConfig> _brushConfigs = {
-  /// 钢笔：中等粗细，强压感变化，模拟毛笔效果
+  /// 钢笔：粗壮平滑，模拟签字笔效果
   BrushType.pen: _BrushConfig(
-    size: 8,
+    size: 10,
-    thinning: 0.7,
+    thinning: 0.65,
-    smoothing: 0.5,
+    smoothing: 0.65,
+    streamline: 0.6,
     simulatePressure: true,
   ),
 
-  /// 铅笔：细线，轻微压感，高平滑度产生自然线条
+  /// 铅笔：纤细有质感，保留书写抖动
   BrushType.pencil: _BrushConfig(
-    size: 4,
+    size: 3,
-    thinning: 0.3,
+    thinning: 0.4,
-    smoothing: 0.7,
+    smoothing: 0.35,
+    streamline: 0.3,
     simulatePressure: true,
   ),
 

app/lib/features/home/bloc/home_bloc.dart

@@ -1,5 +1,7 @@
 // 首页 BLoC — 加载最近日记和心情概览
 
+import 'dart:async';
+
 import 'package:flutter/foundation.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:nuanji_app/data/models/journal_entry.dart';
@@ -78,12 +80,24 @@ final class HomeError extends HomeState {
 
 class HomeBloc extends Bloc<HomeEvent, HomeState> {
   final JournalRepository _journalRepo;
+  StreamSubscription<void>? _changeSubscription;
 
   HomeBloc({required JournalRepository journalRepository})
       : _journalRepo = journalRepository,
         super(const HomeInitial()) {
     on<HomeLoadData>(_onLoadData);
     on<HomeRefresh>(_onRefresh);
+
+    // 监听日记变更，自动刷新首页数据
+    _changeSubscription = _journalRepo.onJournalChanged.listen((_) {
+      add(const HomeRefresh());
+    });
+  }
+
+  @override
+  Future<void> close() {
+    _changeSubscription?.cancel();
+    return super.close();
   }
 
   Future<void> _onLoadData(

app/test/features/calendar/bloc/calendar_bloc_test.dart

@@ -233,4 +233,7 @@ class _FailingJournalRepository implements JournalRepository {
 
   @override
   Future<void> removeElement(String elementId) async {}
+
+  @override
+  Stream<void> get onJournalChanged => const Stream<void>.empty();
 }

app/test/features/home/bloc/home_bloc_test.dart

@@ -271,6 +271,9 @@ class _FailingJournalRepository implements JournalRepository {
   Future<void> removeElement(String elementId) async {
     throw UnimplementedError();
   }
+
+  @override
+  Stream<void> get onJournalChanged => const Stream<void>.empty();
 }
 
 /// 在指定 bloc 上触发事件并等待处理完毕