[UX improment] add tooltips for files in the staged/unstaged area

[ameaninglessname]

These icons is beautiful but I don't know all the meanings of them. A tool-tip would help users like me have a better understanding about what these actions are(added, removed, moved, renamed, etc.). Or is there a place to take reference of what exactly it means?

More related information could be considered adding to the tool-tip.

Thanks for this great tool.

[love-linger]

done. you can try the latest build from Github Action.