feat: copy messages on hoverable icon (#1492)

ui/desktop/src/components/GooseMessage.tsx

@@ -12,6 +12,7 @@ import {
   getToolConfirmationContent,
 } from '../types/message';
 import ToolCallConfirmation from './ToolCallConfirmation';
+import CopyButton from './ui/CopyButton';
 
 interface GooseMessageProps {
   message: Message;
@@ -67,9 +68,17 @@ export default function GooseMessage({ message, metadata, messages, append }: Go
         {/* Always show the top content area if there are tool calls, even if textContent is empty */}
         {(textContent || toolRequests.length > 0) && (
           <div
-            className={`goose-message-content bg-bgSubtle rounded-2xl px-4 py-2 ${toolRequests.length > 0 ? 'rounded-b-none' : ''}`}
+            className={`goose-message-content bg-bgSubtle rounded-2xl px-4 py-2 ${toolRequests.length > 0 ? 'rounded-b-none' : ''} relative group`}
           >
             {textContent ? <MarkdownContent content={textContent} /> : null}
+            {/* Only show CopyButton if there's text content and no tool requests/responses */}
+            {textContent && message.content.every((content) => content.type === 'text') && (
+              <CopyButton
+                text={textContent}
+                className="absolute -bottom-2 -right-2 p-1.5 rounded-full bg-white dark:bg-gray-800 shadow-md z-[1000] hover:bg-gray-100 dark:hover:bg-gray-700 opacity-0 group-hover:opacity-100 transition-opacity"
+                iconClassName="h-4 w-4 text-gray-800 dark:text-white"
+              />
+            )}
           </div>
         )}