fix(spa): redesign remaining pages to light theme

apps/spa/src/components/Navbar.tsx

@@ -271,7 +271,7 @@ export default function Navbar({ categories = [] }: NavbarProps) {
 
       {/* ── MOBILE DRAWER ── */}
       <div
-        className={`fixed inset-0 z-40 md:hidden transition-all duration-300 ${mobileOpen ? 'visible' : 'invisible'}`}
+        className={`fixed inset-0 z-[60] md:hidden transition-all duration-300 ${mobileOpen ? 'visible' : 'invisible'}`}
       >
         {/* Backdrop */}
         <div