bugs under treeland env

```[tasklist]
### Tasks
- [x] RoundRectangle: no round corner
- [x] CheckDelegate: icon lookup
- [x] PopUp: no blur effect
- [ ] 按钮波纹特效消失
- [ ] 鼠标hover到TitleBar其它地方，左上角按钮会出现hover效果
- [ ] 暗色主题适配 FlowStyle中补充暗色主题对应的颜色
- [ ] set custom color of checkDelegate's indicator
- [ ] add invert color flags
- [ ] dtkdeclarative supports dci animation
```
