Add active link indicator in Navbar

Currently, the Navbar does not visually indicate which page or section the user is currently on. This can make navigation less intuitive.

Proposed Enhancement: Add a visual indicator (such as an underline, highlight, bold text, or different color) to the active link in the Navbar. This will help users easily identify the current page.

Benefits:

• Improves user experience and navigation clarity
• Makes the interface more intuitive
• Provides better feedback to the user