fix: apply background and blur to nav element for mobile menu

Move background styling to the nav element itself with rounded corners.
- Add bg-background/95 backdrop-blur-md to nav element
- Add rounded-lg and p-4 for better visual appearance
- Creates frosted glass card effect for the mobile menu

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/layout/Navbar.tsx

@@ -117,8 +117,8 @@ export function Navbar() {
       {/* Mobile Menu Drawer */}
       {mobileMenuOpen && (
         <div className="md:hidden fixed inset-0 top-16 z-50">
-          <div className="container px-4 py-6 bg-background/95 backdrop-blur-md h-full">
-            <nav className="flex flex-col gap-2">
+          <div className="container px-4 py-6">
+            <nav className="flex flex-col gap-2 bg-background/95 backdrop-blur-md rounded-lg p-4">
               {navItems.map((item) => (
                 <Link key={item.href} href={item.href}>
                   <Button