fix: remove all opening, entrance, and load animations across entire application

src/app/admin/coupons/page.tsx

@@ -65,7 +65,7 @@ export default function CouponsAdmin() {
   }
 
   return (
-    <div className="p-8 max-w-6xl mx-auto space-y-8 animate-in fade-in duration-500">
+    <div className="p-8 max-w-6xl mx-auto space-y-8">
       <div>
         <h1 className="text-3xl font-bold tracking-tight">Coupon Management</h1>
         <p className="text-muted-foreground mt-1 font-medium">Create and manage discount codes for subscriptions.</p>