[BUG] No animation while waiting for AI context analysis

[1jifang]

Describe the bug
No animation while light mode processing AI context analysis.

To Reproduce
Steps to reproduce the behavior:

1. Go to a random video
2. Enable AI context analysis and click few subtitle words
3. Then click start analysis, and while waiting for the analysis, the animation is not showing up

Expected behavior
While the users are waiting for the analysis, the animation is supposed to show up.

Screenshots

Environment (please complete the following information):

• OS: [macOS]
• Browser: [Google Chrome]
• Extension Version: [2.1.4]
• Streaming Service: [Disney+]

Additional context
The browser is in light mode, and it is not working.