release: v0.4.0 — React 适配器、loading链式id稳定、dragThreshold、RTL适配、dedupe插件

- React 适配器子包：@metona-team/metona-toast/react — useToast() hook + 声明式 <Toast /> 组件，组件卸载自动清理；react 为 optional peerDependency，主包保持零依赖
- loading 链式转换改原地 update：id 稳定不重建 DOM，转换后 duration 恢复默认自动关闭；update() 支持 duration 变更动态重启计时器
- _emit 幽灵实例修复：beforeShow 拦截后的 toast 不再注册进 _toasts
- dragThreshold 配置项（默认 120px，原硬编码）；RTL 容器 dir 属性 + 进度条/side 条/色条镜像
- dedupe 预设插件：相同 type+message 自动去重，支持 uninstall
- jest 环境隔离测试独立成 tests/ssr.test.ts（resetModules 不再污染共享模块状态）；新增 tests/setup.ts 补 TextEncoder
- 文档：README/docs.html 补 React 适配器、dedupe、dragThreshold；CHANGELOG 更新；328 测试全过

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@metona-team/metona-toast",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "description": "轻量、零依赖、精致美观的Toast通知库。TypeScript源码，开箱即用。",
   "type": "module",
   "main": "dist/metona-toast.cjs.js",
@@ -13,6 +13,19 @@
       "import": "./dist/metona-toast.esm.js",
       "require": "./dist/metona-toast.cjs.js",
       "types": "./dist/metona-toast.d.ts"
+    },
+    "./react": {
+      "import": "./dist/react.js",
+      "require": "./dist/react.cjs.js",
+      "types": "./dist/react.d.ts"
+    }
+  },
+  "peerDependencies": {
+    "react": ">=17.0.0"
+  },
+  "peerDependenciesMeta": {
+    "react": {
+      "optional": true
     }
   },
   "files": [
@@ -64,6 +77,8 @@
     "@rollup/plugin-terser": "^0.4.0",
     "@rollup/plugin-typescript": "^11.1.6",
     "@types/jest": "^29.5.0",
+    "@types/react": "^18.3.31",
+    "@types/react-dom": "^18.3.7",
     "@typescript-eslint/eslint-plugin": "^8.0.0",
     "@typescript-eslint/parser": "^8.0.0",
     "babel-jest": "^29.5.0",
@@ -71,6 +86,8 @@
     "jest": "^29.5.0",
     "jest-environment-jsdom": "^29.5.0",
     "prettier": "^2.8.0",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
     "rollup": "^3.20.0",
     "rollup-plugin-dts": "^5.3.0",
     "rollup-plugin-livereload": "^2.0.5",