Add sun icon for light mode in theme toggle button #423
Description
Describe the issue
Currently, the mode toggle button displays a moon icon to represent dark mode, but there is no corresponding sun icon for light mode. This creates inconsistency in the UI and might confuse users about the current theme state.
Expected Behavior
When in light mode, the toggle button should display a sun icon to indicate that the site is in light mode, just as the moon icon represents dark mode.
Possible Solution
Add a sun icon for light mode so that both modes have clear, intuitive visual indicators.
Additional Context
This change will improve the user experience by making theme toggling more intuitive and visually consistent.