feat: show the last commit message for git files

Just like what github shows files with their last commit msg. I love it.

I've searched man and issues with keyword `git` and `commit` but found nothing about it.
Will you guys consider adding this feature?

No files, tests, or entry points are named. Start by locating the code that renders file listings and checking how Git metadata is currently handled; done means Git-tracked files can show their last commit message without breaking normal output.

Written by the indexing model from the issue text.