feat(ui): enhance mobile navigation with auto-close on item click and…

[x42en]

This pull request improves the mobile navigation experience in the sidebar by ensuring the navigation drawer closes appropriately on mobile devices. The main changes involve updating the sidebar's transition logic, closing the drawer when a navigation item is clicked on mobile, and ensuring the drawer is closed on initial mount for mobile viewports.

Mobile navigation improvements:

• Added a handleNavItemClick method to close the sidebar when a navigation item is clicked on screens smaller than 768px, and attached it to navigation item clicks in AppSidebar.vue. [1] [2]
• Updated the sidebar's transition logic to use left positioning (left-0/-left-full) instead of transform-based transitions for improved mobile compatibility in AppSidebar.vue.
• Ensured the sidebar drawer is always closed when mounting on mobile viewports by adding a check in the onMounted lifecycle hook in useMobileNav.ts.… mount