ESR 140 design updates
Let's use this issue to track any design changes we inherit from upstream as a result of the ESR 140 update, that require intervention from the UX Team.
### Release notes
https://www.mozilla.org/en-US/firefox/140.0beta/releasenotes/
### Running list
- Updated loading spinner: https://gitlab.torproject.org/groups/tpo/ux/-/epics/2#note_3219840
- Acorn icons updates: https://gitlab.torproject.org/groups/tpo/ux/-/epics/2#note_3219843
- Vertical tabs: https://gitlab.torproject.org/groups/tpo/ux/-/epics/2#note_3219845
- OKLCH color palette: https://gitlab.torproject.org/groups/tpo/ux/-/epics/2#note_3219850
- Tab groups: https://gitlab.torproject.org/groups/tpo/ux/-/epics/2#note_3219854
- Address bar refresh: https://gitlab.torproject.org/groups/tpo/ux/-/epics/2#note_3219855
- Biometric authentication for private mode: https://gitlab.torproject.org/groups/tpo/ux/-/epics/2#note_3219861
### Template
<details><summary>Show template</summary>
```
**Summary of change(s)**
Lorem ipsum dolor.
**Issues**
- Gitlab:
- Bugzilla:
**Todo list**
- [ ] Needs updated in Tor Browser
- [ ] Desktop
- [ ] Android
- [ ] Needs updated in Figma
- [ ] Desktop UI
- [ ] Desktop components
- [ ] Desktop styles
- [ ] Android UI
- [ ] Android components
- [ ] Android styles
- [ ] Browser assets
```
</details>
epic