Added auto-scroll-to-top on all page navigations - fixes mobile scrolling issue

- **Navigation auto-scroll**: window.scrollTo(0, 0) added to location.pathname useEffect
- **Mobile UX fix**: No more manual scrolling back up after version selection
- **Smooth navigation flow**: Every route change brings user to page top
- **Better mobile experience**: Prevents getting stuck scrolled down on new pages
- **Applies to all routes**: Home → Books → Chapters → Verses all auto-scroll to top

Mobile users can now seamlessly navigate without manual scrolling between pages!

frontend/src/App.tsx

@@ -43,6 +43,9 @@ function App() {
       // At root path, no version is selected
       setSelectedVersion('');
     }
+
+    // Scroll to top when navigating to new pages
+    window.scrollTo(0, 0);
   }, [location.pathname]);
 
   useEffect(() => {