diff --git a/apps/desktop/src/renderer/src/App.tsx b/apps/desktop/src/renderer/src/App.tsx
index 73213be93..dc5cf23c4 100644
--- a/apps/desktop/src/renderer/src/App.tsx
+++ b/apps/desktop/src/renderer/src/App.tsx
@@ -5,7 +5,6 @@ import { TooltipProvider } from '@multica/ui/components/ui/tooltip'
 import { Toaster } from './components/toaster'
 import Layout from './pages/layout'
 import HomePage from './pages/home'
-import ChatPage from './pages/chat'
 import ProfilePage from './pages/agent/profile'
 import SkillsPage from './pages/agent/skills'
 import ToolsPage from './pages/agent/tools'
@@ -73,7 +72,7 @@ const router = createHashRouter([
           </OnboardingGuard>
         ),
       },
-      { path: 'chat', element: <ChatPage /> },
+      { path: 'chat', element: null },
       { path: 'agent/profile', element: <ProfilePage /> },
       { path: 'agent/skills', element: <SkillsPage /> },
       { path: 'agent/tools', element: <ToolsPage /> },
diff --git a/apps/desktop/src/renderer/src/components/local-chat.tsx b/apps/desktop/src/renderer/src/components/local-chat.tsx
index 39c6c0b38..0f842a059 100644
--- a/apps/desktop/src/renderer/src/components/local-chat.tsx
+++ b/apps/desktop/src/renderer/src/components/local-chat.tsx
@@ -73,12 +73,13 @@ export function LocalChat({ initialPrompt }: LocalChatProps) {
   const currentMeta = current ? providers.find((p) => p.id === current.provider) : null
 
   // Auto-send initial prompt after a short delay
-  const hasSentInitialPrompt = useRef(false)
+  const lastPromptRef = useRef<string | undefined>(undefined)
   useEffect(() => {
-    if (!agentId || !initialPrompt || hasSentInitialPrompt.current) return
+    if (!agentId || !initialPrompt) return
+    if (initialPrompt === lastPromptRef.current) return
 
     const timer = setTimeout(() => {
-      hasSentInitialPrompt.current = true
+      lastPromptRef.current = initialPrompt
       sendMessage(initialPrompt)
       // Remove prompt from URL to prevent re-sending on back navigation
       navigate('/chat', { replace: true })
diff --git a/apps/desktop/src/renderer/src/pages/layout.tsx b/apps/desktop/src/renderer/src/pages/layout.tsx
index 1651e447a..476f61c73 100644
--- a/apps/desktop/src/renderer/src/pages/layout.tsx
+++ b/apps/desktop/src/renderer/src/pages/layout.tsx
@@ -1,3 +1,4 @@
+import { useState, useEffect } from 'react'
 import { Outlet, NavLink, useLocation, useNavigate } from 'react-router-dom'
 import { Button } from '@multica/ui/components/ui/button'
 import { MulticaIcon } from '@multica/ui/components/multica-icon'
@@ -43,6 +44,7 @@ import {
 } from '@multica/ui/components/ui/sidebar'
 import { cn } from '@multica/ui/lib/utils'
 import { ModeToggle } from '../components/mode-toggle'
+import { LocalChat } from '../components/local-chat'
 import { DeviceConfirmDialog } from '../components/device-confirm-dialog'
 import { UpdateNotification } from '../components/update-notification'
 import { useAuthStore } from '../stores/auth'
@@ -151,8 +153,20 @@ export default function Layout() {
   const location = useLocation()
   const navigate = useNavigate()
   const isAgentActive = location.pathname.startsWith('/agent')
+  const isOnChat = location.pathname === '/chat'
   const { user, clearAuth } = useAuthStore()
 
+  // Lazy mount: only mount Chat on first visit, then keep it mounted forever
+  const [chatMounted, setChatMounted] = useState(false)
+  useEffect(() => {
+    if (isOnChat && !chatMounted) setChatMounted(true)
+  }, [isOnChat, chatMounted])
+
+  // Extract initialPrompt from URL search params when navigating to /chat?prompt=...
+  const initialPrompt = isOnChat
+    ? new URLSearchParams(location.search).get('prompt') ?? undefined
+    : undefined
+
   const handleLogout = async () => {
     await clearAuth()
     navigate('/login')
@@ -285,7 +299,14 @@ export default function Layout() {
         <SidebarInset className="overflow-hidden">
           <MainHeader />
           <main className="flex-1 overflow-hidden min-h-1">
-            <Outlet />
+            <div className={cn('h-full', isOnChat && 'hidden')}>
+              <Outlet />
+            </div>
+            {chatMounted && (
+              <div className={cn('h-full flex flex-col overflow-hidden', !isOnChat && 'hidden')}>
+                <LocalChat initialPrompt={initialPrompt} />
+              </div>
+            )}
           </main>
         </SidebarInset>