Leftpad the "Lap" text

So our lines of text don't dance

lib/main.dart

@@ -409,7 +409,7 @@ class _MyHomePageState extends State<MyHomePage> {
                       itemCount: _laps.length,
                       itemBuilder: (context, index) {
                         return ListTile(
-                          title: Text('Lap ${index + 1}: ${_laps[index]}'),
+                          title: Text('Lap ${(index + 1).toString().padLeft(3, '0')}: ${_laps[index]}'),
                         );
                       },
                     ),