【Bug】tdesign_flutter 0.2.7 不兼容 Dart3.5+，IconData 为 final class 无法继承

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【Bug】tdesign_flutter 0.2.7 不兼容 Dart3.5+，IconData 为 final class 无法继承

环境信息

Flutter: 3.22+/3.12
Dart: 3.12.2
tdesign_flutter: 0.2.7
pub镜像：storage.flutter-io.cn

报错信息

Error: The class 'IconData' can't be extended outside of its library because it's a final class.
class _TDIconsData extends IconData

问题说明

1. TDesign官网标注最低兼容 dart >=3.2.6、flutter >=3.16.0，但0.2.7源码硬继承IconData；
2. Dart3.5及以上版本将IconData标记为final class，外部禁止继承，直接编译失败；
3. 更高修复版本（0.3.x/0.6.x）国内flutter-io镜像无收录，用户无法升级规避；
4. 大量使用新版Flutter的开发者无法正常使用组件库，只能降级SDK或更换其他UI库。

诉求

1. 尽快发布修复图标继承问题的新版本；
2. 将新版同步至国内pub镜像；
3. 更新官网适配说明，区分Dart3.5前后兼容区间。

Start from the _TDIconsData declaration that extends IconData and reproduce the failure with the listed Flutter and Dart versions. Confirm the icon implementation builds on Dart 3.5+, then check the compatibility guidance and package publication or mirror availability; done means users can install a released compatible version without the compilation error.