fix oauth-ai-chat

oauth/src/App.jsx

@@ -22,6 +22,10 @@ export default function App() {
   const [showAskAI, setShowAskAI] = useState(false)
   const [showTestUI, setShowTestUI] = useState(false)
   
+  // Simple detection: if the URL contains a date+hash pattern, it's likely an AI post
+  const isAiPost = !pageContext.isTopPage && pageContext.rkey && 
+    /^\d{4}-\d{2}-\d{2}-[a-f0-9]{8}$/.test(pageContext.rkey)
+  
   // Environment-based feature flags
   const ENABLE_TEST_UI = import.meta.env.VITE_ENABLE_TEST_UI === 'true'
   const ENABLE_DEBUG = import.meta.env.VITE_ENABLE_DEBUG === 'true'
@@ -354,6 +358,7 @@ Answer:`
 
   return (
     <div className="app">
+      {!isAiPost && (
       <header className="oauth-app-header">
         <div className="oauth-header-content">
           {user && (
@@ -394,6 +399,7 @@ Answer:`
           </div>
         </div>
       </header>
+      )}
 
       <div className="main-content">
         <div className="content-area">