Track upstream design changes introduced by ESR 140

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: #135 (comment 3164974)
• Acorn icons updates: #135 (comment 3165007)
• Vertical tabs: #135 (comment 3170030)
• OKLCH color palette: #135 (comment 3196767)
• Tab groups: #135 (comment 3205326)
• Address bar refresh: #135 (comment 3205329)
• Biometric authentication for private mode: #135 (comment 3211637)

Template

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**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