Add Ternary Search Magic Trick interactive and fix layout issues

- Create new Ternary Search Magic Trick interactive with ternary search logic
- Add emoji buttons and 'not present' option for better UX
- Implement 'How it Works' modal with embedded YouTube video
- Fix layout margins when accessing interactives from theme pages
- Add standalone and green screen pages for the new interactive
- Update Data Structures theme to include the new interactive

src/pages/TernarySearchTrickPage.tsx

@@ -0,0 +1,13 @@
+import TernarySearchTrick from '@/components/TernarySearchTrick';
+
+const TernarySearchTrickPage = () => {
+  return (
+    <div className="min-h-screen bg-background flex items-center justify-center">
+      <div className="w-full max-w-6xl px-4 py-8">
+        <TernarySearchTrick showSocialShare={true} />
+      </div>
+    </div>
+  );
+};
+
+export default TernarySearchTrickPage;