优化UI

core/frontend/src/routes/messages.tsx

@@ -363,6 +363,7 @@ export function MessagesPage({ unreadCount, onMarkRead, onMarkAllRead, onArchive
 
   return (
     <div className="msg-page">
+      <div className="msg-inner">
       <div className="page-head">
         <button className="msg-back" type="button" onClick={() => navigate("dashboard")} aria-label="返回">
           <ArrowLeft size={18} strokeWidth={1.75} />
@@ -537,6 +538,7 @@ export function MessagesPage({ unreadCount, onMarkRead, onMarkAllRead, onArchive
           )}
         </section>
       </div>
+      </div>
 
       {toast && (
         <div className="toast show" role="status" aria-live="polite">