style(feedback): group copy and feedback buttons together on the left

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/workspace/messages/message-list-item.tsx

@@ -63,13 +63,10 @@ export function MessageListItem({
         <MessageToolbar
           className={cn(
             isHuman ? "-bottom-9 justify-end" : "-bottom-8",
-            "absolute right-0 left-0 z-20",
+            "absolute right-0 left-0 z-20 opacity-0 transition-opacity delay-200 duration-300 group-hover/conversation-message:opacity-100",
-            !isHuman && runId && threadId
-              ? "opacity-100"
-              : "opacity-0 transition-opacity delay-200 duration-300 group-hover/conversation-message:opacity-100",
           )}
         >
-          <div className="flex gap-1 opacity-0 transition-opacity delay-200 duration-300 group-hover/conversation-message:opacity-100">
+          <div className="flex gap-1">
             <CopyButton
               clipboardData={
                 extractContentFromMessage(message) ??
@@ -77,14 +74,14 @@ export function MessageListItem({
                 ""
               }
             />
+            {!isHuman && runId && threadId && (
+              <FeedbackButtons
+                threadId={threadId}
+                runId={runId}
+                initialFeedback={feedback ?? null}
+              />
+            )}
           </div>
-          {!isHuman && runId && threadId && (
-            <FeedbackButtons
-              threadId={threadId}
-              runId={runId}
-              initialFeedback={feedback ?? null}
-            />
-          )}
         </MessageToolbar>
       )}
     </AIElementMessage>