Improve Search Box Background Color in Dark Mode

[AdityaGahukar]

Fixes #67

Description:

This PR updates the search box background and text color specifically for dark mode to improve readability and user experience.

Changes:

• In dark mode, the search box background is now --principal-text-color (white).
• The text inside the search box is now --primary-text-color (black) in dark mode.

Before:

• The search box had the same background (--primary-text-color: #121212;) in both light and dark modes, making it harder to see in dark mode.

After:

• The search box now has a white background and black text in dark mode for better contrast and readability.

Testing:

• Verified in both light and dark modes that the search box correctly switches background and text color.

Screenshots:

Before

After

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Feel free to review and provide any feedback. Thanks!