UI/UX to see unstaged changes

[phuctm97]

VSCode built-in Git lets you stage changes and see new unstaged changes - this is very useful when you're working multiple steps/parts towards a bigger goal, you stage changes that you're happy with and then continue working, the unstaged changes are what you need to review next. Without this view, one would have to commit many times to have similar experience.

The current default Zed Git view show only tracked and untracked changes. If I staged some changes to a file, then make a few more changes to that file, I won't be able to see what I just changed, I can only see everything uncommited changes.