feat(chat): 修复 Strategy/Workspace 统一聊天布局与历史路由归属

frontend-web/src/pages/StrategyRoutes.tsx

@@ -1,7 +1,8 @@
 import { Navigate, Route, Routes } from "react-router-dom";
 import { Toaster } from "sonner";
 
-import { SidebarProvider } from "@/components/ui/sidebar";
+import { SidebarInset, SidebarProvider } from "@/components/ui/sidebar";
+import { WorkspaceSidebar } from "@/components/workspace/workspace-sidebar";
 import { getAccountDisplayName, getStoredAuth } from "@/core/auth";
 import { isSentimentAgentVisible } from "@/core/sentiment-agent/config";
 import { RouteBaseProvider } from "@/core/route-base";
@@ -79,6 +80,24 @@ import AdminScheduledTasksPage from "./AdminScheduledTasksPage";
 import AdminUserActivityPage from "./AdminUserActivityPage";
 import { ChatRuntime } from "./WorkspaceRoutes";
 
+/**
+ * Strategy's legacy `/chats/:thread_id` route shares ChatPage's header.
+ * Unlike WorkspaceRoutes it did not render a WorkspaceSidebar, leaving the
+ * header's expand/collapse control with no visible panel to operate.
+ */
+function StrategyChatThreadLayout() {
+  return (
+    <div className="flex size-full min-h-0 overflow-hidden">
+      <WorkspaceSidebar compactChrome />
+      <SidebarInset className="min-w-0">
+        <ChatRuntime>
+          <ChatPage />
+        </ChatRuntime>
+      </SidebarInset>
+    </div>
+  );
+}
+
 export default function StrategyRoutes() {
   const storedAuth = getStoredAuth();
   const canManageBusinessMappings = !storedAuth || storedAuth.system_role === "admin";
@@ -342,11 +361,7 @@ export default function StrategyRoutes() {
             <Route path="chats" element={<ChatsPage />} />
             <Route
               path="chats/:thread_id"
-              element={
-                <ChatRuntime>
-                  <ChatPage />
-                </ChatRuntime>
-              }
+              element={<StrategyChatThreadLayout />}
             />
 
             <Route path="agents" element={<AgentsPage />} />