New tab bookmarks and context menus don't respect application theming

**Description**
Very low contrast between "Widgets" text and background image, bookmark backgrounds and some context menus should be dark but are white instead

**Screenshots**

<img width="1332" height="497" alt="Image" src="https://github.com/user-attachments/assets/ce9e68fc-80d4-4453-95fa-d7351c4d6ea0" />

**Tweaks in use**

**Additional context**

