feat: add copy bubble button to copy entire message content (#245)

- Hover over any message to reveal a copy icon button
- Click to copy the full message text to clipboard
- Shows success/error toast notification
- Skips tool messages (no copy button shown)
- i18n support for all 8 languages (EN/ZH/DE/ES/FR/JA/KO/PT)
- Dark mode compatible styling

Co-authored-by: 356252190-star <356252190-star@users.noreply.github.com>

packages/client/src/i18n/locales/de.ts

@@ -137,6 +137,9 @@ export default {
     thinkingHide: 'Denkprozess ausblenden',
     thinkingDuration: 'Beobachtet {duration}',
     thinkingChars: '{count} Zeichen',
+    copyBubble: 'Nachricht kopieren',
+    copiedBubble: 'Nachricht kopiert',
+    copyFailed: 'Kopieren fehlgeschlagen',
   },
 
   // Jobs

packages/client/src/i18n/locales/en.ts

@@ -160,6 +160,9 @@ export default {
     thinkingHide: 'Hide thinking',
     thinkingDuration: 'Observed {duration}',
     thinkingChars: '{count} chars',
+    copyBubble: 'Copy message',
+    copiedBubble: 'Message copied',
+    copyFailed: 'Copy failed',
   },
 
   // Jobs

packages/client/src/i18n/locales/es.ts

@@ -137,6 +137,9 @@ export default {
     thinkingHide: 'Ocultar pensamiento',
     thinkingDuration: 'Observado {duration}',
     thinkingChars: '{count} caracteres',
+    copyBubble: 'Copiar mensaje',
+    copiedBubble: 'Mensaje copiado',
+    copyFailed: 'Error al copiar',
   },
 
   // Jobs

packages/client/src/i18n/locales/fr.ts

@@ -137,6 +137,9 @@ export default {
     thinkingHide: 'Masquer le raisonnement',
     thinkingDuration: 'Observé {duration}',
     thinkingChars: '{count} caractères',
+    copyBubble: 'Copier le message',
+    copiedBubble: 'Message copié',
+    copyFailed: 'Échec de la copie',
   },
 
   // Jobs

packages/client/src/i18n/locales/ja.ts

@@ -137,6 +137,9 @@ export default {
     thinkingHide: '思考過程を隠す',
     thinkingDuration: '観測 {duration}',
     thinkingChars: '{count} 文字',
+    copyBubble: 'メッセージをコピー',
+    copiedBubble: 'コピーしました',
+    copyFailed: 'コピーに失敗しました',
   },
 
   // スケジュールジョブ

packages/client/src/i18n/locales/ko.ts

@@ -137,6 +137,9 @@ export default {
     thinkingHide: '사고 과정 접기',
     thinkingDuration: '관측 {duration}',
     thinkingChars: '{count}자',
+    copyBubble: '메시지 복사',
+    copiedBubble: '복사됨',
+    copyFailed: '복사 실패',
   },
 
   // 예약 작업

packages/client/src/i18n/locales/pt.ts

@@ -137,6 +137,9 @@ export default {
     thinkingHide: 'Ocultar raciocínio',
     thinkingDuration: 'Observado {duration}',
     thinkingChars: '{count} caracteres',
+    copyBubble: 'Copiar mensagem',
+    copiedBubble: 'Mensagem copiada',
+    copyFailed: 'Falha ao copiar',
   },
 
   // Jobs

packages/client/src/i18n/locales/zh.ts

@@ -160,6 +160,9 @@ export default {
     thinkingHide: '收起思考过程',
     thinkingDuration: '已观察 {duration}',
     thinkingChars: '{count} 字',
+    copyBubble: '复制消息',
+    copiedBubble: '已复制',
+    copyFailed: '复制失败',
   },
 
   // 定时任务