fix: unify entry animations and eliminate layout flicker on overview, syllabus tracker, and doubt forum

src/components/PremiumGate.tsx

@@ -13,14 +13,10 @@ interface PremiumGateProps {
 export function PremiumGate({ featureKey, children }: PremiumGateProps) {
   const { hasAccessTo, loading, user } = useActiveUser();
 
+  // Allow children to render immediately without a blocking center spinner
+  // so that page entry animations (animate-section) execute smoothly on route transition.
   if (loading || !user) {
-    return (
-      <div className="flex-1 min-h-[400px] flex items-center justify-center">
-        <div className="flex flex-col items-center gap-4">
-          <div className="w-10 h-10 border-4 border-[var(--cyan-ai-20)] border-t-[var(--cyan-ai)] rounded-full animate-spin"></div>
-        </div>
-      </div>
-    );
+    return <>{children}</>;
   }
 
   if (!hasAccessTo(featureKey)) {