Fixed NLT TypeScript compilation error

- Updated handleVersionSelect function in App.tsx to accept 'nlt' type
- Resolved TS2322 compilation error for NLT in version selector
- NLT can now be selected from UI and compilation succeeds

NLT is fully functional in the application!

frontend/src/App.tsx

@@ -261,7 +261,7 @@ function App() {
 
   // Component for the version selection page (root)
   const VersionPage = () => {
-    const handleVersionSelect = (version: 'esv' | 'nkjv') => {
+    const handleVersionSelect = (version: 'esv' | 'nkjv' | 'nlt') => {
       navigate(`/version/${version}`);
     };