This pull request significantly enhances the NavbarComponent by introducing an animated indicator for the active navigation item on desktop, improving accessibility, and unifying link handling for both desktop and mobile navigation. The changes also clean up and modernize the codebase by leveraging React hooks and utility functions.

Navigation indicator and accessibility improvements:

• Added an animated indicator bar that visually highlights the active navigation item on desktop, updating its position and size based on the current route and user interactions such as hover and focus. This uses new state and refs (indicatorStyle, desktopNavRef, desktopItemRefs) and updates on route changes, window resize, and navigation events.
• Improved accessibility by setting aria-current="page" on the active navigation link and ensuring keyboard focus and mouse interactions update the indicator appropriately.

Navigation structure and code quality:

• Unified link rendering for both mobile and desktop: all navigation items now use a single pattern for handling external links (target="_blank", rel="noopener noreferrer") and internal routing, reducing duplication and improving maintainability.
• Refactored navigation logic to use a new isActiveRoute helper, supporting exact and partial route matching for active state detection.