Standardize page wrappers, add showSocialShare prop, and add Cmd+K search

- Standardize all page wrappers to use consistent min-h-screen bg-background pattern
- Remove Layout wrapper usage from pages that had it
- Remove page-level SocialShare and headers, move into components
- Add showSocialShare prop to all interactive components for consistent control
- Add Cmd+K / Ctrl+K command palette search across all interactives
- Export allInteractives from InteractiveIndex for reuse

Co-Authored-By: Neeldhara Misra <mail@neeldhara.com>

src/pages/ErdosDiscrepancyPuzzlePage.tsx

@@ -1,15 +1,12 @@
-import Layout from "@/components/Layout";
 import ErdosDiscrepancyPuzzle from "@/components/ErdosDiscrepancyPuzzle";
 
 const ErdosDiscrepancyPuzzlePage = () => {
   return (
-    <Layout>
-      <div className="py-8 px-4">
-        <div className="max-w-6xl mx-auto">
-          <ErdosDiscrepancyPuzzle showSocialShare={true} />
-        </div>
+    <div className="min-h-screen bg-background">
+      <div className="container mx-auto px-4 py-8">
+        <ErdosDiscrepancyPuzzle showSocialShare={true} />
       </div>
-    </Layout>
+    </div>
   );
 };