release: v0.3.13 — MeToast 集成与全面质量修复

- 集成 MetonaToast v2.0.0 替换自研 Toast 组件（右上角、进度条、自动关闭、主题联动）
- 修复 sidebar resize 未持久化到 IndexedDB
- 修复 Ctrl+Tab MRU 切换逻辑与文档不一致
- 完善 WYSIWYG 模式标签切换选区恢复
- 清理死代码（useActiveHeading observerRef、旧 Toast 样式、重复滚动条样式、SearchReplace 重复检查）
- 同步 DESIGN.md / docs 文档（CodeMirror→Milkdown、stores 计数、editorStore 字段）
- 新增 .npmrc.example 模板
- 更新关于对话框与文档远程地址为 Gitea
- 版本号 0.3.12 → 0.3.13

docs/optimization-requirements.json

@@ -8,7 +8,7 @@
     "typescript": "5.6.3",
     "vite": "electron-vite 3.0.0",
     "stateManagement": "zustand 5.0.6",
-    "editor": "CodeMirror 6",
+    "editor": "Milkdown 7.21.1 (WYSIWYG) + textarea (source mode)",
     "database": "Dexie (IndexedDB)"
   },
   "currentStatus": {
@@ -46,7 +46,11 @@
           "effort": "small",
           "details": {
             "configFormat": "ESM flat config (eslint.config.js)",
-            "plugins": ["@typescript-eslint/eslint-plugin", "eslint-plugin-react-hooks", "eslint-plugin-react-refresh"],
+            "plugins": [
+              "@typescript-eslint/eslint-plugin",
+              "eslint-plugin-react-hooks",
+              "eslint-plugin-react-refresh"
+            ],
             "rules": [
               "typescript-eslint/recommended",
               "react-hooks/recommended",