Windows control is disabled when `userChrome.autohide.tabbar`

### Describe the bug

enabling `userChrome.authohide.tabbar` causing window control to be hidden

### Expected behavior

_No response_

### Screenshots

_No response_

### OS

Windows 11

### OS - Others

_No response_

### Firefox Version

v133

### Distribution

- [ ] [Original Lepton](https://github.com/black7375/Firefox-UI-Fix)
- [ ] [Lepton's photon style](https://github.com/black7375/Firefox-UI-Fix/tree/photon-style)
- [ ] [Lepton's proton style](https://github.com/black7375/Firefox-UI-Fix/tree/proton-style)

### Theme

- [ ] Light
- [ ] Dark
- [ ] Alpenglow (System: Light)
- [ ] Alpenglow (System: Dark)
- [ ] System Default
- [ ] Others: (e.g. [Photon Colors](https://addons.mozilla.org/en-US/firefox/addon/photon-colors/), [Google Chrome Dark](https://addons.mozilla.org/en-US/firefox/addon/google-chrome-dark/), [Fairytale Of Nature](https://addons.mozilla.org/en-US/firefox/addon/fairytale-of-nature/))

### Theme - More Info

_No response_

### `user.js` setup

user.js setup

```javascript
// Your settings
```

### Additional context

cc #1029

Start by reproducing the issue on Windows 11 with Firefox v133 and the userChrome.autohide.tabbar setting enabled. Trace the SCSS rules controlling the autohide tab bar and window controls; done means the window controls remain visible while the tab bar autohides.

Written by the indexing model from the issue text.