1. restore background color
2. fix border radius on top/bottom and on hover
3. parent link is now full-row again, much easier to click
4. parent link now uses directory icon, matching github
5 changed grid layout to remove auto width on file name column which could get too small.
6. mobile layout now shows more of the filename.
---------
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
1. use grid instead of table, completely drop "ui table" from that list
2. move some "commit sign" related styles into a new file by the way (no
change) because I need to figure out where `#repo-files-table` is used.
3. move legacy "branch/tag selector" related code into repo-legacy.ts,
now there are 13 `import $` files left.
