バージョンを2.4.2に更新しREADMEにchangelog追記

AI Overviewの送信ボタンがテーマのボタンスタイルに上書きされ
巨大な矩形（矢印が隠れる場合あり）で表示される不具合の修正(#122)を
2.4.2として記載。ボタンの構造スタイルをスコープ化し、テーマ側から
サイズ・形状を上書きできないようにした。Stable Tag・プラグインVersion・
package.jsonのバージョンを2.4.2に揃える。

Author: claude

README.md

@@ -3,7 +3,7 @@
 Contributors: tarosky, hametuha, Takahashi_Fumiki, bissy    
 Tags: faq,help  
 Tested up to: 7.0  
-Stable Tag: 2.4.1  
+Stable Tag: 2.4.2  
 License: GPL 3.0 or later  
 License URI: https://www.gnu.org/licenses/gpl-3.0.html
 
@@ -113,6 +113,10 @@ You can contribute to our github repo. Any [issues](https://github.com/tarosky/h
 
 For full release notes of each version, see [GitHub Releases](https://github.com/tarosky/hamelp/releases).
 
+### 2.4.2
+
+- Fix the AI Overview send button rendering as an oversized rectangle (with the arrow sometimes hidden) on themes whose button styles overrode the plugin CSS. The button's structural styles are now scoped so theme styles can no longer override its size and shape.
+
 ### 2.4.1
 
 - Redesign the AI Overview question box as a ChatGPT-style auto-growing **textarea** with a circular send button inset at the bottom-right. Submit with **Enter** (Shift+Enter for a newline), with IME composition handled. Adds accessible labels and focus handling, a helper hint, and a responsive full-width layout.

hamelp.php

@@ -3,7 +3,7 @@
  * Plugin Name:     PubPla AI Help Center
  * Plugin URI:      https://wordpress.org/plugins/hamelp
  * Description:     AI powered FAQ and Help Document Management Plugin for WordPress.
- * Version:         2.4.1
+ * Version:         2.4.2
  * Author:          Tarosky
  * Author URI:      https://tarosky.co.jp
  * Domain Path:     /languages

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "hamelp",
-	"version": "2.4.1",
+	"version": "2.4.2",
 	"description": "FAQ generator for WordPress",
 	"scripts": {
 		"test": "RESULT=${PWD##*/} && wp-env run tests-cli ./wp-content/plugins/$RESULT/vendor/bin/phpunit -c ./wp-content/plugins/$RESULT/phpunit.xml.dist",