バージョンを2.4.3に更新しREADMEにchangelog追記

AI Overviewの送信ボタンがボタンにmin-widthを設定する一部テーマで
横長楕円として表示される不具合の修正(#124)を2.4.3として記載。
ボタンの幅を制約し（2.4.2の高さ修正を補完）、テーマスタイルに
関係なく円形を維持するようにした。Stable Tag・プラグインVersion・
package.jsonのバージョンを2.4.3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: 2.4.2  
+Stable Tag: 2.4.3  
 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).
 
+### 2.4.3
+
+- Fix the AI Overview send button appearing as a horizontal ellipse on themes that set a button min-width. The button's width is now constrained (complementing the height fix in 2.4.2) so it stays a circle regardless of theme styles.
+
 ### 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.

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:         2.4.2
+ * Version:         2.4.3
  * Author:          Tarosky
  * Author URI:      https://tarosky.co.jp
  * Domain Path:     /languages

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "hamelp",
-	"version": "2.4.2",
+	"version": "2.4.3",
 	"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",