feat(nav): 底部导航图标与文字放大

lib/core/widgets/app_bottom_nav.dart

@@ -107,7 +107,7 @@ class _NavDestination extends StatelessWidget {
                   color: item.selected ? AppColors.blue : unselectedColor,
                 ),
               ),
-              const SizedBox(height: 2),
+              const SizedBox(height: 3),
               Text(
                 item.label,
                 maxLines: 1,