Feature: Add git tab to the details pane

### What feature or improvement do you think would benefit Files?

Adding a git tab will provide space to display stashes, commit history, and maybe even some common git commands like reset head.

### Requirements

- Add "git" tab to the details pane in git repos
- Add a section for committing changes
- Add a section for changes
- Add a section for history
- Add a section for stashes

### Design


### Files Version

v2.4.82

### Windows Version

Windows 11

### Comments

_No response_

Start by locating the details pane entry point and how the app detects git repositories. Review the linked design and existing git-related behavior before deciding how the committing, changes, history, and stashes sections fit together. Done means the git tab appears only in git repositories and provides all four requested sections.

Written by the indexing model from the issue text.