wxiaoguang 1f00bc44b2 Fix review UI (#27322)
Close #26730


1. The `diff-detail-box` was abused, it shouldn't be used for
"DiffFileList/DiffFileTree".
2. Fix the sticky position for various screens.



![image](https://github.com/go-gitea/gitea/assets/2114189/558a5c06-c94c-4e5c-8395-d38473dd21c2)


![image](https://github.com/go-gitea/gitea/assets/2114189/3390fb0e-7dc7-457f-bd0c-398fdb6d24c0)


![image](https://github.com/go-gitea/gitea/assets/2114189/d19dd350-aecf-4909-8ef9-73b09d94560e)
2023-09-28 10:00:26 +00:00
..
2023-09-28 10:00:26 +00:00
2023-09-28 10:00:26 +00:00