test(ui): 更新主题导航与布局断言

test/home/app_bottom_nav_test.dart

@@ -10,7 +10,7 @@ void main() {
   test('should_use_exact_root_navigation_colors', () {
     expect(AppColors.navBackground, const Color(0xFF000000));
     expect(AppColors.navSelected, const Color(0xFFFFFFFF));
-    expect(AppColors.navUnselected, const Color(0xFF8E8E93));
+    expect(AppColors.navUnselected, const Color(0xFFB0B0B0));
   });
 
   testWidgets('should_render_four_slots_with_white_selected_state', (