Fix animation inconsistencies on pages with loading spinners

src/app/dashboard/cbt/history/[attemptId]/page.tsx

@@ -88,7 +88,7 @@ export default function AttemptHistoryPage({ params }: { params: Promise<{ attem
   const maxScore = attempt.total_questions * 4;
 
   return (
-    <div className="max-w-6xl mx-auto p-8 animate-in fade-in zoom-in-95 slide-in-from-bottom-4 duration-500">
+    <div className="max-w-6xl mx-auto p-8">
       <Link href={backRoute} className="inline-flex items-center text-sm text-muted-foreground hover:text-foreground mb-6 transition-colors">
         <ArrowLeft size={16} className="mr-2" /> {test?.type === 'DPS' ? 'Back to PrepPilot AI' : 'Back to Tests'}
       </Link>

src/app/dashboard/cbt/page.tsx

@@ -337,7 +337,7 @@ export default function CBTPage() {
       </div>
 
       {showUpgradeModal && (
-        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/80 backdrop-blur-sm animate-in fade-in zoom-in-95 slide-in-from-bottom-4 duration-500">
+        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/80 backdrop-blur-sm">
           <div className="bg-background border border-border shadow-2xl rounded-2xl w-[450px] p-8 text-center space-y-6 animate-in zoom-in-95 duration-200">
             <div className="size-16 rounded-full bg-red-500/10 flex items-center justify-center mx-auto text-red-500">
               <Lock size={32} />