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Not exactly what you are looking for, but github.dev provides much of this for repos hosted at github. Press . while accessing the repository at github.com to jump right into github.dev (this appears to require me being logged in so it's possible I configured this somehow).

I just started working on a project with this use case in mind.

So far just a "browse" experience somewhat like GitHub, but uglier.

Soon want to add ability to commit, similar to GitHub desktop, but without electron.

Very WIP atm but hoping to work on it some this week.

https://github.com/stereosteve/git-goggles

It doesn't do half of those things but somewhat amazingly there is one built into Git itself:

https://git-scm.com/docs/gitweb

Sounds like you want "ungit": https://github.com/FredrikNoren/ungit