test(app): 前端第一批测试 — EditorBloc 19用例 + JournalElement 11用例 + InMemoryRepo 12用例

添加 mocktail 测试依赖 + 字体文件占位
总计 42 测试通过，覆盖工具/笔画/元素/撤销/重做/序列化/乐观锁/CRUD

app/pubspec.lock

@@ -768,6 +768,14 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "2.0.0"
+  mocktail:
+    dependency: "direct dev"
+    description:
+      name: mocktail
+      sha256: "5e1bf53cc7baa8062a33b84424deb61513858ea05c601b8509e683815b5914aa"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.0.5"
   nested:
     dependency: transitive
     description:
@@ -992,6 +1000,62 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "5.0.2"
+  shared_preferences:
+    dependency: "direct main"
+    description:
+      name: shared_preferences
+      sha256: c3025c5534b01739267eb7d76959bbc25a6d10f6988e1c2a3036940133dd10bf
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.5.5"
+  shared_preferences_android:
+    dependency: transitive
+    description:
+      name: shared_preferences_android
+      sha256: e8d4762b1e2e8578fc4d0fd548cebf24afd24f49719c08974df92834565e2c53
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.4.23"
+  shared_preferences_foundation:
+    dependency: transitive
+    description:
+      name: shared_preferences_foundation
+      sha256: "4e7eaffc2b17ba398759f1151415869a34771ba11ebbccd1b0145472a619a64f"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.5.6"
+  shared_preferences_linux:
+    dependency: transitive
+    description:
+      name: shared_preferences_linux
+      sha256: "580abfd40f415611503cae30adf626e6656dfb2f0cee8f465ece7b6defb40f2f"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.4.1"
+  shared_preferences_platform_interface:
+    dependency: transitive
+    description:
+      name: shared_preferences_platform_interface
+      sha256: "649dc798a33931919ea356c4305c2d1f81619ea6e92244070b520187b5140ef9"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.4.2"
+  shared_preferences_web:
+    dependency: transitive
+    description:
+      name: shared_preferences_web
+      sha256: c49bd060261c9a3f0ff445892695d6212ff603ef3115edbb448509d407600019
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.4.3"
+  shared_preferences_windows:
+    dependency: transitive
+    description:
+      name: shared_preferences_windows
+      sha256: "94ef0f72b2d71bc3e700e025db3710911bd51a71cefb65cc609dd0d9a982e3c1"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.4.1"
   shelf:
     dependency: transitive
     description: