[Broken Website] Google Sheets - Ribbon(s)

### Prerequisites

- [x] I [searched for any existing report](https://github.com/darkreader/darkreader/issues?q=is%3Aissue) about this website issue to avoid opening a duplicate.
- [x] I can reproduce this website issue in a new, unmodified web browser profile with Dark Reader installed as the only extension.

### Website Issue Description

The Ribbon in Google sheets only shows either all black or all white

The buttons are clickable, but I can't see them

### Website Address

sheets.google.com

### Steps To Reproduce

1. Log into sheets.google.com
2. Open any sheet

### Screenshots

Log into sheets.google.com. Edit any sheet.

### Operating System

MacOS Sequoia 15.4.1 (24E263)

### Web Browser name and version

Chrome Version 136.0.7103.49 (Official Build) (arm64)

### Dark Reader version

Version 4.9.103

### Additional Context

_No response_