update docs

Author: keyboard3

official/docs/CHANGELOG.md

@@ -16,7 +16,7 @@ sidebar_position: 6
 - [Android 沉浸式浏览器](https://immersivetranslate.com/)
 - [iOS 沉浸式浏览器](https://immersivetranslate.com/)
 
-## 1.18.8 Preview (2025-06-26)
+## 1.18.9 Preview (2025-06-30)
 
 - 新增：任务奖励中心。
 - 优化：站内自动翻译支持自定义【进阶设置】->【站内页面自动翻译】。

official/i18n/en-US/docusaurus-plugin-content-docs/current/CHANGELOG.md

@@ -16,7 +16,7 @@ The **Preview version** is published more frequently and includes some experimen
 - [Android Browser](https://immersivetranslate.com/)
 - [iOS Browser](https://immersivetranslate.com/)
 
-## 1.18.8 Preview (2025-06-26)
+## 1.18.9 Preview (2025-06-30)
 
 - Added: Task reward center.
 - Improved: In-site auto translation supports customization [Advanced Settings] -> [Enable site auto-translation].

official/i18n/zh-TW/docusaurus-plugin-content-docs/current/CHANGELOG.md

@@ -16,7 +16,7 @@ sidebar_position: 6
 - [Android 沉浸式瀏覽器](https://immersivetranslate.com/)
 - [iOS 沉浸式瀏覽器](https://immersivetranslate.com/)
 
-## 1.18.8 Preview (2025-06-26)
+## 1.18.9 Preview (2025-06-30)
 
 - 新增：任務獎勵中心。
 - 優化：站內自動翻譯支持自定義【進階設定】->【站內自動翻譯】。