fix(phase-a): actually remove Neo provider JSX from App.tsx

Python heredoc string replacement missed the JSX wrapper lines due to
indentation mismatch. Rewrote App.tsx directly. Previous commit removed
the imports but left NeoUserProvider/NeoInstituteProvider in the JSX,
causing ReferenceError at runtime (Vite builds without tsc so it
compiled clean despite the undefined references).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/App.tsx

@@ -7,26 +7,20 @@ import { UserProvider } from './contexts/UserContext';
 import AppRoutes from './AppRoutes';
 import React from 'react';
 
-// Wrap the entire app in a memo to prevent unnecessary re-renders
 const App = React.memo(() => (
   <BrowserRouter future={{ v7_startTransition: true, v7_relativeSplatPath: true }}>
     <ThemeProvider theme={theme}>
       <AuthProvider>
         <UserProvider>
-          <NeoUserProvider>
-            <NeoInstituteProvider>
           <TLDrawProvider>
             <AppRoutes />
           </TLDrawProvider>
-            </NeoInstituteProvider>
-          </NeoUserProvider>
         </UserProvider>
       </AuthProvider>
     </ThemeProvider>
   </BrowserRouter>
 ));
 
-// Add display name for better debugging
 App.displayName = import.meta.env.VITE_APP_NAME;
 
 export default App;