fix: 对话区域显示问题修复

frontend-web/src/pages/IframeChatPage.tsx

@@ -313,10 +313,11 @@ export default function IframeChatPage() {
             </div>
           </header>
           <main className="flex min-h-0 max-w-full grow flex-col overflow-hidden">
-            <div className="flex size-full justify-center">
+            <div className="flex size-full min-w-0">
               {!isLandingState && (
                 <MessageList
                   className={cn("size-full", "pt-10")}
+                  contentClassName="mx-0 max-w-full px-3 sm:px-4"
                   threadId={threadId}
                   thread={thread}
                   paddingBottom={messageListPaddingBottom}
@@ -332,7 +333,7 @@ export default function IframeChatPage() {
                   isLandingState && "-translate-y-[calc(50vh-96px)]",
                   isLandingState
                     ? "max-w-(--container-width-md)"
-                    : "max-w-(--container-width-lg)",
+                    : "max-w-full",
                 )}
               >
                 <div className="absolute -top-4 right-0 left-0 z-0">

frontend-web/src/pages/WorkspaceRoutes.tsx

@@ -43,6 +43,14 @@ import RoundtablePlanningPage from '@/roundtable-planning/pages/RoundtablePlanni
 import '@/roundtable-planning/styles/roundtable-planning.css';
 import { cn } from '@/lib/utils';
 
+function isInIframe(): boolean {
+  try {
+    return window.self !== window.top;
+  } catch {
+    return true;
+  }
+}
+
 export function WorkspaceLayout({
   children,
   pageSidebarCollapsed,
@@ -116,6 +124,30 @@ export function ChatRuntime({ children }: { children: ReactNode }) {
   );
 }
 
+function NewChatEntryRoute({
+  layoutProps,
+}: {
+  layoutProps: {
+    pageSidebarCollapsed: boolean;
+    pageSidebarHidden: boolean;
+    headerHidden: boolean;
+    compactWorkspaceSidebar: boolean;
+    pageSidebarDark: boolean;
+  };
+}) {
+  if (isInIframe()) {
+    return <Navigate to="/page/workspace/chats_iframe/new" replace />;
+  }
+
+  return (
+    <WorkspaceLayout {...layoutProps}>
+      <ChatRuntime>
+        <ChatPage />
+      </ChatRuntime>
+    </WorkspaceLayout>
+  );
+}
+
 export default function WorkspaceRoutes({
   pageSidebarCollapsed = false,
   pageSidebarHidden = false,
@@ -149,6 +181,10 @@ export default function WorkspaceRoutes({
             </WorkspaceLayout>
           }
         />
+        <Route
+          path="chats/new"
+          element={<NewChatEntryRoute layoutProps={layoutProps} />}
+        />
         <Route
           path="chats/:thread_id"
           element={