Contributed two UI enhancements to the Tencent/tdesign-flutter repository, focusing on navigation customization and visual consistency. Developed a customWidget parameter for TDNavBarItem, replacing the deprecated iconWidget and allowing any widget to serve as a navigation component, which increased design flexibility. Enhanced TDTreeSelect by introducing an outward corner radius control property, resolving previous visual inconsistencies and improving user experience. All changes were implemented using Dart and Flutter, with attention to custom painting and front end development best practices. Updated tests and documentation to support migration, and collaborated with other teams to ensure a smooth rollout and maintain code quality.