fix: pass payload struct for regenerate/edit/download commands, edit button visibility

ui/src/pages/ChatPage.tsx

@@ -718,15 +718,19 @@ function MessageBubble({
         ) : isUser ? (
           <>
             <div className="whitespace-pre-wrap">{message.content}</div>
-            {!streaming ? (
+            <div
+              className={`mt-1 flex justify-end transition-opacity ${
+                streaming ? "opacity-0" : "opacity-0 group-hover:opacity-100"
+              }`}
+            >
               <button
-                className="absolute -left-8 top-2 hidden rounded p-1 text-slate-500 hover:text-slate-200 group-hover:block"
+                className="rounded px-1.5 py-0.5 text-[10px] text-white/60 hover:bg-white/10 hover:text-white"
                 onClick={() => onEditStart(message)}
-                title="编辑并重新提交"
+                title="编辑并重新提交（清空之后的生成）"
               >
-                ✎
+                编辑
               </button>
-            ) : null}
+            </div>
           </>
         ) : message.content ? (
           <ReactMarkdown remarkPlugins={[remarkGfm]}>{message.content}</ReactMarkdown>